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3 years ago

7

A normal distribution has a mean of 142 and a standard deviation of 16. What is the probability that a randomly selected value l

ies between 142 and 174? A) 0.22 B) 0.34 C) 0.48 D) 0.54

1 answer:

jolli1 [7]3 years ago

6 0

$\mathbb P(142$

Approximately 95% of any normal distribution lies within two standard deviations of the mean, i.e. $\mathbb P(-2$ . Because the distribution is symmetric, you have $\mathbb P(-2$ , so $\mathbb P(0$ .

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