koolguyd07 koolguyd07

15-05-2023
Mathematics

Answered

The publishers of a study guide claim that their book will increase the average
quarterly math grades of readers to 85%. In a random sample of 20 students who
have used the study guide, the math grade was 82%, with a standard deviation of
8%.
Find the z-value and type it into the box, rounded to the nearest hundredth.

Answer :

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