1) 62, 52, 52, 52, 64, 69, 69, 76 For the given sample data, find – the standard

Question

1) 62, 52, 52, 52, 64, 69, 69, 76

For the given sample data, find –

the standard deviation. 8.64581__________

P15 ______________

The percentile rank of a score of 64 __________________

2). The mean of a set of data is 5.07 and its standard deviation is 3.39. Find the z-score for a value of 9.65. _______________________

3). Which is better and corresponds to the higher relative position, a score of 92 on a test with a mean of 71 and a standard deviation of 15, or a score of 688 on a test with a mean of 493 and a standard deviation of 150? ____________________________________

4). On a given registration day, 45 CJ majors and 25 CIS majors arrive. What is the empirical probability that the next student to arrive will be a CJ major? ___________________________

Explanation / Answer

2) MEAN = 5.07

STANDARD DEVIATION = 3.39

X = 9.65

Z SCORE = (X - MEAN)/STANDARD DEVIATION = (9.65 - 5.07)/3.39 = 1.35

Z SCORE = 1.35

THE PROBABILITY = 0.9115

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