There are 2076 people at a concert. One third of the people at the concert are under thirty years old. How many people are under thirty years old?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

What are two numbers that have a sum of 15

X² + 4y² = 36 the major axis runs along: a) y=4x b) x-axis c) y-axis