it is known that the average distance from one’s residence to a grocery store is 15 miles with a standard deviation of 10. What is the probability that if 10 people are surveyed, the average distance is less than 13 miles from the closest grocery store?

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,