3 years ago

A teacher graded the tests for each of her students. She calculated a mean grade of 80 and a

Mathematics

1 answer:

son4ous [18]3 years ago

7 0

Answer:

Katrina got 86 in her test

Step-by-step explanation:

given

mean = 80

standard deviation = 3

z-score = 2

Let score of Katrina = x

Recall z-score is calculated by

z-score = (x-mean) / standard deviation

substitute values and solve for x

2 = (x-80)/3

x-80=6

x = 86

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