Question

Question 1 (1 point) Full time PhD students receive an sverage of $12,837 a year. If the average salaries are normally distributed with a standard deviation of $1,500 find these probabilities: a. The student makes more than $15,000 b. The student makes between $13,000 and $14,000 Question 2 (1 point) The mean number of miles driven per vehicle annuallyin the U.S is 12,494 miles. Choose a randomly selected vehicle, and assume mileage is normally distributed with a standard deviation of 1290 miles. What is the probability that the vehicle was driven more than 15,000 miles? Less than 8,000 miles? Would you buy a vehicle if if you had been told it had been driven less than 6,000 miles in the past year?

Answer 1

Date aiven thut AL:一年一12,834 5o, SDO 一 21-p (211442) Answer -- 0.014土 b P C13.OUD 14DD0) p(+3bbD - 1283王述-441000-10839 1 5DD ) Sto o.牛809-0.5433 20 23+6 Answer 0 21k

从 12.499 2-gb bo bo /29 D ー 1-2 ( 221-942 6) 0 g000) plーメー4-1-8000 - 12494) 504 2 123D 2 0 DDb2