if u from TEXAS are you ready for STAAR or if u from a diff state or country r u ready for end of year exams

What is the number 321,000,000 in scientific notation? also what is the number? ?

∆red ≅ ∆ by rule will give brainiest if possible

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.