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09-01-2020
Mathematics

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The scores on a statistics exam have a normal distribution and have a mean of 99 and a standard deviation of 11. One individual’s score is 128. Find the z-score of this value.

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10-01-2020

Answer:

2.64

Step-by-step explanation:

The z score is calculated as

z=(x-mean)/Sd

The mean of scores of statistics exam=μ=99

The standard deviation of scores of statistics exam=σ=11

Individual's score in statistics exam=x=128

z=128-99/11=29/11=2.64

Hence, the z score of individual score is 2.64.

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