Question

1. From many long years of experience, the weather bureau knows that the temperature on the 4th of July in Seattle is a normal random variable with μ=70 degree (Fahrenheit) and σ2=302. What is the probability that the temperature will be below freezing un Seattle on 4th of July?

Answer #1

is what we want to find where

Note

But

Thus, we are looking for with

Looking up a normal table, we find is the required probability that it will be below freezing on July 4th in Seattle

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