2.99
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The distribution of spring high temperatures in Los Angeles is approximately Normal, with a mean of 75 degrees and a standard deviation of 2.5 degrees.

a. What is the probability that the high temperature is less than 70 degrees in Los Angeles on a day in spring?

b. What percentage of Spring day in Los Angeles have high temperatures between 70 and 75 degrees?

c. Suppose the hottest spring day in Los Angeles had a high temperature of 91 degrees. Would this be considered unusually high, given the mean and the standard deviation of the distribution? Why or why not?