4/7 of your birthday cake was eaten on your birthday. the next day, your dad ate 1/2 of what was left. you get to finish the cake, how much do you get to eat? can someone me with this problem? ?

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.