A class of n = 15 students takes an exam, and the class average is M = 76.5.  The professor grants a re-take to one student in the class, and this student’s grade goes up from X = 75 to a new score of X = 94.  What is the new class mean?

Q: A sample of n = 9 scores has a mean of M = 20. One of the scores is changed and the new mean is…

A: The formula of the mean : Mean= sum of observationsnumber of observationssum of observations = meanM…

Q: A student must have an average​ (the mean) on five tests that is greater than or equal to​ 80% but…

A: Let x be the range of grade in fifth test.

Q: From the analysis of students’ marks, Mr Adam decided to do one-to-one consultation with his…

A: If we consider that the students should bring the marks above the median, they are only exempted…

Q: A sample of n = 11 scores has a mean of M = 4. One person with a score of X = 16 is added to the…

A: The mean of11 scores is 4. The sum of the 11 scores is, Sum∑iXi=Mean×Number of scores=4×11=44

Q: A sample of n = 6 scores has a mean of M = 10. One score in sample is changed from X = 12 to X = 0.…

A: Given that, n = 6  mean of M = 10

Q: On a psychology exam with a µ = 76 and σ = 12,  Tom scores at the mean,  Mary had a score of X =…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: After six biology test, Ruben has a mean score of 77. What score does Ruben need on the next test to…

A:

Q: c) the gestation time differs from the mean by more than 3 weeks. d) of 100 boys born in upstate NY…

A: Given, for males born in upstate NY, the gestation times are normally distributed with a mean of 39…

Q: A sample of n = 7 scores has a mean of M = 16 to X = 20. What is the value for the new sample me

A:

Q: eart attack or stroke within one year, and of the ticagrelor patients, 565 suffered a heart attack…

A:

Q: Larry is a 62% free-throw shooter, that is to say that anytime Larry attempts a free-throw, there is…

A: Given data, p=62% =0.62 n=70   Mean=?

Q: A sample of n = 9 scores has a mean of M = 13. After one score is added to to the sample, the mean…

A: The sample of 9 scores has a mean 13. The sum of 9 scores is, Sum=n×M=9×13=117 After adding one…

Q: In a sample of n= 6 scores, five of the scores are each above the mean by one point. Where is the…

A: The mean of a data can be obtained as follows:

Q: John calculated r -.44 for a set of n 10 pairs of values that represent the number of absences from…

A: Given that r = -0.44 midterm exam score ( y )   number of absences from class (x)

Q: On a reading examination given to 900 students, Elaine’s score of 602 was higher than the scores of…

A: Solution

Q: On a psychology exam withµ= 76 and o = 12, Tom scored 9 points below the mean, Mary had a score of X…

A: From the provided information, Mean (µ) = 76 Standard deviation (σ) = 12 X~N (76, 12)

Q: After taking a series of 4 classroom examinations, John obtained a mean score of 82. How much score…

A: Mean is a part of measures of central tendency.

Q: On a psychology exam with µ = 76 and o = 12, Tom scored 9 points below the mean (M), Mary %3D had a…

A: Given, On a psychology exam with μ =76 and σ=12, Tom scored 9 points below the mean(M), Mary had a…

Q: A population of N=15 scores has £x=120. What is the population mean

A: Given, The population mean is obtained by the formula-

Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than…

A: It is given that n is 1,817 and x is 400.

Q: s the newly hired manager of a company that provides cell phone service, you want to determine the…

A: It is given that margin of error (E) is 0.92 and the confidence level is 0.90.

Q: What is the difference between the average resistance to happiness at age 20 and at age 70?

A: Given :-  R = 4.6 - 0.02x put x = 20. ⇒R=4.6 - 0.02 × 20⇒R=4.6 - 0.4⇒R=4.2 Now, put x = 70 ⇒R=4.6 -…

Q: The relative risk of developing lung cancer among individuals who smoke is 15.0. Which of the…

A: Relative risk is the ratio of probability of an outcome in an exposed group to the probability of an…

Q: N=15 scores has ΣX=120.

A: Given, N=15 ∑X=120

Q: A sample of n = 11 scores has a mean of M = 55.  One new score is added to the sample and the new…

A: It is given that , A sample of n=11 has a mean of M =55.

Q: Two types of medical devices used for knee replacement are being studied to see if the type of knee…

A: Given, The infection rate for a specific bacterial infection after surgery for device A is 0.0043.…

Q: On a certain exam, Tony corrected 10 papers and found the mean for his group to be 75. Alice…

A: Given: Tony corrected 10 papers and mean for his group is 75 and Alice corrected the remaining 20…

Q: Given x = 0, 1, 2, 3, 4, 5 how is the mean 1.5? Shouldn't the mean of x be 2.5?

A: Measures of Central Tendency: A measure of central tendency represents the central value or typical…

Q: A sample of 9 freshmen takes a reading comprehension test and their scores are a mean of 10 and…

A: Consider that μ defines the population mean score.

Q: After six biology tests, Ruben has a mean score of 74. What score does Ruben need on the next test…

A: The mean score of Ruben after six biology tests is 74.

Q: If a person’s z score equals 2.08, what is their percentile?

A: Given info: The person’s z score equals 2.08.

Q: Given that there are 30 students in a class taking an exam. The average for Past years is μ0=86, σ=…

A: It is given that the population standard deviation is 7 and the true mean is 87.7. Also, the test…

Q: NCAE shows that the average score of the students is 80 and sd is 15. What is the percentile rank of…

A: Given :     Mean (μ)=80Standard deviation (σ) = 15x=84

Q: Con side that the ten Percent of indlividuals getting tested for the Virus, have the Virus. Now…

A: Let A be the event denoteds the person having virus and B be the event denote the event the person…

Q: The mean of Fred's 6 test Scores is 86. His teacher will drop his lowest grade of 78. What is Fred's…

A: Given The mean of Fred's 6 test score is 86. His teacher will drop his lowest grade of 78. So we…

Q: A sample of n = 7 scores has a mean of M = 5. After one new score is added to the sample, the new…

A: Given: The sample of scores is n=7. The value of the mean is M=5. Let X be a random variable…

Q: Sarah works for the Urban Pollination Project at UW. Five years ago, 25% of urban gardens were…

A: From the provided information, 25% of urban gardens were visited by native bees that is p = 0.25 The…

Q: Is the difference of means significant ? The value of t for 9 degress of freedom at 5% level is 2.26

A:

Q: After six biology tests, Ruben has a mean score of 75. What score does Ruben need on the next test…

A: Let 'x' denote the score Ruben need to score on the next, i.e. seventh test so that his average…

Q: The percentage of scores falling below a z-score of .65

A:

Q: n a tasting experiment, individuals were asked to score between 1-10 for the taste of the product.…

A: Given Information: In a tasting experiment, individuals were asked to score between 1 to 10 for the…

Q: As shown in the table, the average number of siblings (sibs) for 1018 middle class adults is 3.15.…

A: Introduction: It is required to determine if the middle class of the country come from smaller…

Q: A sample with a mean of M=8 has EX=56. How many scores are in the sample

A: The formula for mean is as follows: M =∑iXinn =∑iXiM

Q: A researcher wants to test whether UBC students are more intelligent than the general population. He…

A: Given: population mean (μ)=100population standard deviation (σ)=15sample size (n)=36Sample mean…

Q: One researcher wants to estimate the proportion of MU students who are vegetarian, 6 answered "yes".…

A:

Q: After six biology tests, Ruben has a mean score of 72. What score does Ruben need on the next test…

A:

Q: a sample on n=7 scores has a mean of M= 16. one score in the sample is changed from X= 6 to X= 20.…

A:

Q: (d) How high a score must you have in order to be in the top quarter of the population in social…

A: (d) The high score for order to be in the top quarter of the population in social insight is,…

Q: ACT scores range from 1 to 36 and are normally distributed where N (21.5, 5.4). SAT scores• range…

A: The z score indicates how many standard deviations that a data points away from the mean. It can be…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.