Questions 14-16 refer to the following. The statistics exam score has an average of 75 with a standard deviation of 10 points. We draw a random sample of 25 exams. Let the random variable representing the mean (average) score of the 25 exams. What is the distribution of Xbar? Group of answer choices N(75, 10) N (75, 2) U(10, 75) Not enough information

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14-16 fast please

Questions 14-16 refer to the following.

The statistics exam score has an average of 75 with a standard deviation of 10 points. We draw a random sample of 25 exams. Let  the random variable representing the  mean (average) score of the 25 exams.

  1. What is the distribution of Xbar?
Group of answer choices
N(75, 10)
N (75, 2)
U(10, 75)
Not enough information
 
 

Find the probability that the mean score Xbar is between 68 and 79.

Group of answer choices
0.4135
0.5865
0.1692
0.9770
 
 

Find the 75th percentile for the mean score Xbar.

Group of answer choices
81.74
68.26
76.35
58.75
 
 
 
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