2 years ago

On a standardized exam, the scores are normally distributed with a mean of 135 and a

Mathematics

1 answer:

labwork [276]2 years ago

3 0

Answer:

-1

Step-by-step explanation:

mean, mu = 135.

Standard deviation = 20

X = 115

use the z score formula : $z = \frac{x-mu}{standard deviation}$

to get (115-135)/20 = -1

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