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## Statistics

1) For the sample with a standard deviation of 10, a score of X = 44 corresponds to a z-score of 0.50. Based on this information, determine the sample mean?

a) A score of X = 55 on an exam which has the mean of 60 and a standard deviation of 5.

b) A score of X = 40 on the exam which has the mean of 50 and a standard deviation of 20.

3) For a sample with mean = 50 and standard deviation = 10.

a) Determine the z-score for each of the following X values:

X = 60
X = 75
X = 30

b) Now determine the score (X value) which corresponds to each of the z-scores given below:
z = 0.8
z = 1.5
z = -1.5

In a typical week, how many times do you eat at the fast food restaurant?  The following data was then collected:

No. of times per week              No. of students
5 or more                                         2
4                                                      2
3                                                      3
2                                                      6
1                                                      0
0                                                      3
Total                                                 6

Assume you randomly choose one person from this sample of students.

A. Determine the probability that the student eats at a fast food restaurant 5 or more times per week?

B. Determine the probability that the student eats at a fast food restaurant 2 or more times per week?

C. What are the odds that student eats at the fast food restaurant zero times per week?

Statistics and Probability, Statistics

• Category:- Statistics and Probability
• Reference No.:- M910330

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