The test grades of a science class are given. 78, 75, 70, 92, 69, 83, 98, 76, 75, 82, 91, 89 the grades are normally distributed with a mean of 81.5 and a standard deviation of 9.3. what is the z-score of the highest grade in the test? round the answer to the nearest hundredth.

1.77

Step-by-step explanation:

Given : The test grades of a science class are given.

78, 75, 70, 92, 69, 83, 98, 76, 75, 82, 91, 89

The grades are normally distributed with a mean and a standard deviation .

let x be any random variable represents the test grades of a science class.

Formula for z-score:-

The highest score= 98

Then , the z-score of the highest grade in the test will be :-

Hence, the z-score of the highest grade in the test =1.77

answer: ok

step-by-step explanation:

1.m=2

2.m=-6

3.m=3

4.m=1/2

glad to