Example 14. A candidate obtains the following percentages in an examination. English 4070, Mathematics 67%, Sanskrit 72%, Economics 58%. Political Science 53%. It is agreed to give double weights to marks in English and Mathematics as compared to other subjects. What is the weighted mean?

Q: Number of pairs of observations of X and Y=8 X series Arithmetic Mean 74-5 X series Assumed Mean 69-...

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Q: The average starting salary of students who graduated from colleges of Business in 2009 was $48,400....

A: Solution: Given that:  n= 100 Sample size  x= $50000 Sample mean μ= $48400 Population mean σ= $8000 ...

Q: Have you ever tried to get out of jury duty? About 25% of those called will find an excuse (work, po...

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Q: Activity 1 A. Identify the type of sampling technique used by the researcher in each of the followin...

A: Given some situations, we have to identify the type of sampling used in each situation.  Simple rand...

Q: Find the regression equations from the following data : Age of husband : 18 19 20 21 22 23 24 25 26 ...

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Q: Ten students of B. Com., class of a college have obtained the following marks in statistics out of 1...

A: Here use given data for  standard deviation   

Q: manufacturer of aspirin claims that the proportion of headache sufferers who get relief with their a...

A: Given data,Probability of success is p=63.8%=0.638If n=430P(X<58.4%)=?

Q: a) In how many ways can this be done? b) What is the probability that continent of Asia gets all th...

A: Here Given  Total 80 diplomats  No of Women=10 No of Men=70

Q: A blind taste test is conducted to determine which of two​ colas, Brand A or Brand​ B, individuals p...

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Q: sample of 10 rice farms in Pila, Laguna was taken using systematic sampling with a sampling rate of ...

A: Given data, A sample of 10 rice farms in Pila No of farms say irritated(Yes) is 5 No of farms say no...

Q: Use n= 10 and p = 0.6 to complete parts (a) through (d) below. (a) Construct a binomial probability ...

A: (b) Obtain the value of mean. The value of mean is obtained below as follows: The value of mean is ...

Q: Suppose a 90% confidence interval estimate mean is (25.2, 43.4). Now, using the same exact informati...

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Q: t is a striking fact that the first digits of numbers in legitimate records often follow a distribut...

A: Given The chart of first digit and proportion  

Q: In the lecture video, we learn that if o is given, then the 95% confidence interval for u is: P(,- 1...

A: Symmetric confidence interval are always better than non symmetric

Q: The average number of accidents at controlled intersections per year is 5.6. Is this average a diffe...

A: We have given that  Sample size n =67 Sample mean =5.8 Sample standard deviation =0.6 NOTE:- Accordi...

Q: : Calculate the S.D. of the following : Size of the item : 7 8 9 10 11 12 Frequency : 3 13 8 5 4

A: We have given that  I want find standard deviation (SD) Mean = sum of all observations/total number ...

Q: A simple random sample of sizen=15 is drawn from a population that is normally distributed. The samp...

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Q: If the sampled population has a mean of A = 04 and a population standard deviation of o = distributi...

A: We have given that,   Population mean (μ) = 64, population standard deviation (σ) = 10 and sample si...

Q: Fill in the table below (last row is for sums). y ry -9 8 -11 8 -12 Sums Calculate the following by ...

A: We have given that,  The data set are: X :- 6,    8,    8 Y :- -9, -11, -12 Then,  We will find the ...

Q: You want to be 95% confident that the population mean is between 9.5 and 10.5, how big of a sample s...

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Q: Two professors at a local college developed a new teaching curriculum designed to increase students'...

A: Solution-: Given: n=15,x=11,P0=0.55,α=0.1 Sample proportion is, ∴p^=xn=1115=0.7333 (a) State the app...

Q: Nationally, patients who go to the emergency room wait an average of 4 hours to be admitted into the...

A: As per our guidelines we can solve first three sub part (c) ,(d) and (e) of question and rest can be...

Q: Suppose that X~Uniform( –2,8), find (a) The mean value of this random variable. (b) The standard dev...

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Q: Listed below are pulse rates (beats per minute) from samples of adult males and females. Does there ...

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Q: Find the area of the shaded region under the standard normal distribution to the left of the given z...

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Q: 10. Given below are the marks obtained by 200 students of a university in statistics paner Marks: 40...

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Q: The ranks of the same 15 students in two subjects A and B are given below ; the two numbers within t...

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Q: Determine whether each of the following scenarios describes a geometric setting. If so, define an ap...

A: Given that, a. A popular brand of cereal puts a card bearing the image of 1 of 5 famous NASCAR drive...

Q: The manager of a fast-food restaurant wishes to estimate the mean waiting time customers spend at th...

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Q: Use n= 10 and p= 0.4 to complete parts (a) through (d) below. (a) Construct a binomial probability d...

A: Given data,n=10p=0.4Construct a binomial probability distribution with given parameters

Q: Sives tossing 3 a certaln game 6 cents for 1 head. is 9 cents a fair price to pay to play this game?...

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Q: Based on the data shown below, a statistician calculates a linear model y = 0.9x + 10.29 3 13.18 4 1...

A: The calculated regression model is , y = 0.9x + 10.29 

Q: 20.20 Life insurance. You might sell insurance to a 20-year-old friend. The probability that a man a...

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Q: uppose that X~N(µ, o²) and that P(X 3.6) = 0.6554, what are the alues of u and o?

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Q: rresponding t8! You are given 1 or 2 z-score(s) and heed to shade the area (=probability) P(z > 1.2)...

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Q: Holding everything else constant, what would happen if the sample size had been n=1? The confidence ...

A: We have given that the sample satisfaction score is normally distributed with mean 67 and sample sta...

Q: se n= 10 and p = 0.6 to complete parts (a) through (d) below. U.0016 U.2150 0.0106 0.1209 3 0.0425 9...

A: We have given that,  Let X be the random variable from binomial distribution with probability (p) = ...

Q: The data in the chart shows the maximum and corresponding resting heart rate of a healthy 20-year ol...

A: Solution-: Let, X=Resting heart rate and Y=Maximum heart rate We have following data: X Y 50 16...

Q: Goofy Marketing Solutions conducted a survey among 16 randomly selected visitors to the newly opened...

A: The random variable satisfaction score follows normal distribution. We have to construct 95% confide...

Q: It takes an average of 10.9 minutes for blood to begin clotting after an injury. An EMT wants to see...

A: Disclaimer : “Since you have posted a question with multiple sub-parts, we will solve first three su...

Q: A density curve for all the possible temperatures between 0°F and 40°F is a rectangle. What is the h...

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Q: The time required for an automotive center to complete an oil change service on an automobile approx...

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Q: The claim is that for a smartphone​ carrier's data speeds at​ airports, the mean is μ=18.00 Mbps. Th...

A: Given information Hypothesized mean µ = 18.00 Mbps Sample size (n) = 24 The value of test statistics...

Q: he number of chocolate chips in an​ 18-ounce bag of chocolate chip cookies is approximately normally...

A: Note: I'm authoring only part d as a,b,c, are already authored Given data,Mean μ=1252sd     σ=129d)W...

Q: . What is the probability that the amount of liquid hand soap consumed in a month per secondary scho...

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Q: 9. How does the t- distribution differ from the standard normal z distribution? A. The means are dif...

A: We want to tell you which one is the correct choice 

Q: or a standard normal distribution, find: P(z > -1.2) Express the probability as a decimal rounded t...

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Q: A random sample of 64 automobiles traveling on a section of an interstate showed an average speed of...

A: Solution-: Given: x¯=65,n=64,σ=13.5,c=0.865 We find, The 86.5% C.I. for the μ (in mph)=?

Q: A credit score is used by credit agencies (such as mortgage companies and banks) to assess the credi...

A: From the provided information, Sample size (n) = 39 Sample mean (x̄) = 719.9 Sample standard deviati...

Q: The life expectancy of a particular brand of tire is normally distributed with a mean of 60,000 and ...

A: