Suppose that the population standard deviation is unknown. If 8% of all sample means are smaller than 13 and the population mean is still 15, what is the value of the standard deviation?

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Which graph represents the same relation is the sa which graph represents the same relation as the set {(-3-2)}

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15