Pls help pls and thank you

(40 points) i need some . an answer definition is appreciated as well.

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

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.