Find the value of x.

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.