At a summer camp there are 10 teenagers sleeping in each tent. assume that these 10 teenagers are independent of each other. what is the probability that at least one of them suffers from arachnophobia?

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount