A Widely Used IQ Test for Children Is Constructed to Have

Short Answer

A widely used IQ test for children is constructed to have a normal distribution with a mean of 100 and a standard deviation of 15 for children in a very, very large national sample. If a child is selected at random from the national sample, what is the probability that his or her IQ score will be
(a) above 90
(b)between 90 and 110
(c)above 150
(d)The probability is .50 that the child's IQ score will be within (how many) IQ points of the mean (on either side)
(e)The probability is .10 that the child's IQ score will fall above what IQ score