Aset of data whose histogram is extremely skewed yields a sample mean and standard deviation of 68.5 and 12.75, respectively. what is the minimum percentage of observations that:
a. are between 43 and 94.
percentage = at least %
b. are between 30.25 and 106.75.
percentage = at least %

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0