Question

The high temperature x (in degrees centigrade) during winter-time in washington

d.c. varies according to the normal distribution with mean 21 and standard deviation 10.the probability is 0.3 that a randomly selected winter day in washington


d.c. will have a high temperature greater than _______ centigrade. which number completes the sentence correctly

Answer 1

A suitable probability calculator can tell you the desired temperature is about 26.2 °C.

_____

The invNorm function on this calculator gives the x-value below which the probability distribution has the given area. Since you want the x-value for the area above being 0.3, the area below that x-value will be 1-0.3 = 0.7.