"The marks of the students in a certain examination are normally distributed with mean marks at 40% and standard deviation marks at 20%. On this basis, 60% students failed. The result was moderated and 70% students passed. Find the pass marks before and after the moderation.

Q: A sample is selected from a population with a mean of population mean= 100 and a standard deviation ...

A:

Q: How can I view boxplots and histogram on ti83

A: The TI-83 is a series of graphing calculators manufactured by Texas Instruments. The original TI-83 ...

Q: In a large psychology study, each subject took two IQ tests (form L and form M of the Stanford-Binet...

A: Given: Scatter Plot

Q: couples are in a round table but men and women must sit alternately. In how many ways can this be do...

A:  * SOLUTION :-  Given that ,  6 couples are in a round table but men and women must sit alternately....

Q: Let W be the random variable that gives the number of heads (C) minus the number of tails (+) in thr...

A: Given: 3 tossed of a coin W=Number of Heads - Number of Tails

Q: Example 9-32. Show that the mean value of positive square root of a y (u) variate is T(u +;)/T(u). H...

A:

Q: (a) Calculate the median of X. (b) Note: No need to show the second derivative. Calculate the mode o...

A:

Q: Verify that f(x) is a valid pmf. Find the expected amount of time Trevor takes to get ready for work...

A: It is given that X = number of minutes Trevor takes to leave for work. Note : According to our guide...

Q: Use the given confidence interval to find the margin of error and the sample mean.   ​(13.7​,20.7​) ...

A: Given Data Lower limit = 13.7 upper limit = 20.7

Q: The data in the following table show the association between cigar smoking and death from cancer for...

A:

Q: The probability that a statistics graduate from a Canadian university gets a data science job is 0.6...

A: Given that  Number of trials n=10 Success of probability p=0.6 X~Binomial ( n,p) Probability mass fu...

Q: Let W be the random variable that gives the number of heads (C) minus the number of tails (+) in thr...

A: Given that  W be the random variable that gives the number of heads (C) minus the number of tails (+...

Q: The mean and standard deviation of 200 items are found to be 60 and 20 respectively. If at the time ...

A:

Q: The accompanying data represent the pulse rates (beats per minute) of nine students. Treat the nine ...

A: Z-score is given by, z score=(x-μ)/σ where μ is mean and σ is standard deviation.  Let x represents ...

Q: Give five different numbers whose mean is 11 and range is 14.

A: Here use basic formula of mean and range

Q: A web administrator is interested in the average number of visitors per day that her website receive...

A: * ANSWER :-  From the given information the answer is provided as  below   

Q: 4. Use the data provided in Table 1 to answer questions 4(a)-4(e): Table 1. Seaweed (Ulva) biomass f...

A: Since you have posted a question with multiple sub parts, according to our guidelines we can solve f...

Q: d) Name a better sampling method the principal could use. Describe how this sample could be collecte...

A: Sampling is the method is a way which used to make sample. There are two types of sampling, they are...

Q: The systolic blood pressure (BP) of adults in the USA is nearly normally distributed with a mean of ...

A: We have given that.   X~N( μ , ?^2 )   μ =121 , ? =18   Z-score =( x - μ )/?

Q: The quantity of Calcium level in the blood of a man follows a normal distribution with a stand devia...

A:

Q: Male and female populations of tortoises under 80 years old are represented by age in the table belo...

A: Formula for mean and standard deviation  Mean=∑f⋅x/n Variance=((∑f⋅x2-(∑f⋅x)2/n)/n) Standard deviati...

Q: Example 17-34. Let x1, x2, ..., x, denote random sample of size n from a uniform population with p.d...

A:

Q: The given figure is a stem-and-leaf display of the number of families per barangay who are recipient...

A: a. There are 70 leaves in the given stem and leaf plot. The number of observations in the original d...

Q: A random variable X has the following probability distribution : 4 5 0-1 0:2 0.4 02

A:

Q: "LANGAW" PROBLEM SOLVING A population of flies Z is known to have a rate of growth proportional to Z...

A:

Q: Find the missing information in the following table : A B Combined Number 10 8 24 Mean 20 15 Geometr...

A:

Q: e) The main benefit of an observational study is we can determine causation between two variables. f...

A: For each of the given statements, we have to justify whether the statement is true or false and alse...

Q: Examine the scatter diagrams in figure below and then answer the following questions. a) (b) a) Whic...

A: Scatterplot is a graphical representation between two variables, where each of the points of the plo...

Q: eshman, 19 sophomores, 14 juniors and 6 seniors. One student is selected at ndom. What is the sample...

A:

Q: Consider a radar system that uses radio waves to detect aircraft. The system receives a signal and, ...

A:

Q: Find the margin of error for the given values of​ c, s, and n.   c=0.90​, s=6​, n= 9   The margin of...

A:

Q: In​ Marissa's calculus​ course, attendance counts for 10​%of the​ grade, quizzes count for 15​% of t...

A:

Q: You are conducting a study to see if the accuracy rate for fingerprint identification is significant...

A:

Q: Let X1, X2, X3,..., X, be a random sample from a distribution with known variance Var(X,) = o?, and ...

A:

Q: cm/sec) and let y be a random variable representing drift rate of sand (i 100 g/cm/sec). A test site...

A: Given: r=0.949 x: wind velocity y: sand drift rate x y 70 3 115 45 105 21 82 7 93 16 ...

Q: 1 In class, the definition of the sample variance was Li=1 n-1 31(x; - x)². Show that 1 this is equi...

A:

Q: 4. Events occur according to a Poisson Process with rate A events occurred during the first hour. 10...

A: Given λ=10/hour2 events occured during 1st hour

Q: Suppose a bank branch, located in a commercial district, is concerned with its service during the no...

A: We have given that data  Observations in the ascending order are :0.38,2.44,2.95,3.37,3.45,3.61,4.32...

Q: nnual per capita consumption of milk is 21.6 gallons. You believe milk consumption higher there and ...

A: We have given that  Sample size n =16 Sample mean= 24.1 Standard deviation =4.8

Q: The partially completed inventory record for the rotor subassembly in the table below shows gross re...

A: Given, Inventory record for the rotor subassembly in the table is given which shows the followings:-...

Q: Find the correlation coefficient for each of the two data sets shown below. (a) (c)

A: Given: (a) x y 1 5 1 3 1 5 1 7 2 3 2 3 2 1 3 1 3 1 4 1   (c) x y 1 2...

Q: x < 0 0 < x < 2 2 F (x) = 3x 8 2 1 2 < x

A: The cumulative distribution function of the continuous random variable X is given by F(x)  is a cumu...

Q: Average speed on a freeway is  80  mph.   Among all vehicles 65% drive 8 miles above the speed limit...

A: Average speed on a freeway is 80 mph.  Among all vehicles 65% drive 8 miles above the speed limit of...

Q: The weight of an energy bar is approximately normally distributed with a mean of 42 10 grams with a ...

A: The weight of an energy bar is approximately Normally distributed.    Mean = μ = 42.10 grams Standar...

Q: 3. A delivery truck travels from point A to point B and back using the same route each day. There ar...

A: Given,   X/Y 0 1 2 3 4 0 0.01 0.01 0.03 0.07 0.01 1 0.03 0.05 0.08 0.03 0.02 2 0.03 0.11 0....

Q: Watching all these drones buzz back and forth is giving you eyestrain. But you can’t just count ever...

A: Step 1 Hi, as per company policy, we'll answer the first 3 subparts. Kindly repost the question and...

Q: prosecutor’s fallacy- A begin “someone has Covid” and B being “someone tests positive.” A girl you...

A: Given: prosecutor’s fallacy-A begin “someone has Covid” and B being “someone tests positive.”  A gir...

Q: Two cards are drawn (a) successively with replacement -(b) simultaneously (successively without repl...

A:

Q: olic blood pressure of adults in the USA is nearly normally distributed with a mean of 120 ndard dev...

A: We have given that.   X~N( μ , ?^2 )   μ =120 , ? = 16   Z-score =( x - μ )/?   NOTE:- According to ...

Q: The feeding behavior of black bream (a type of fish) spawned in aquariums was studied in Brain, Beha...

A: Given: Age of Fish (x) Number of Strikes 85 120 63 136 34 150 39 155 58 162 35 169 ...