The subject is statistics

1. An IQ test shows that the scores follow a normal distribution with a mean of 100 and a standard
deviation of 15.
a) Find the actual IQ scores associated with the middle 80% of the population.
ibutions given the following i irmation
b) Find the actual IQ score associated with the lowest 15%.
c) Calculate the Z-score for the upper 7% of IQ scores
d) Calculate the actual test score for the highest 1% of IQ's.