A principal believes 50% of her music students reported their practice hours accurately. Based on that assumption, she ran 200 simulations of random samples. She found the mean of each run. Then she found the mean, 48%, and standard deviation of all the means, 18%, to create a normal distribution.
According to that distribution, which option below gives the best description of how likely is it that a single survey would return a mean of 30%?
A. extremely likely
B. likely
C. unlikely
D. extremely unlikely

To find the extreme values of a function f(x. y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x, y)=xy

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

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?