Ethan has a bag of marbles. He has a total of 15 marbles. 3 are red, 5 are blue and 7 are green. If Ethan randomly picks are marble what is the probability he will pick a red marble? 7/15

0.2

3/6

8/15

Given the parent function of [tex]f(x)=x^4[/tex], what change will occur when the function is changed to [tex]f(\frac{1}{2} x)[/tex]?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Which rotation about its center will carry a regular hexagon onto itself