7. Which of the following data sets would have a standard deviation closest to zero? (1) {1,3,4,6,9}
(3) {6,6,6,7,7}
(2) {15, 18, 20, 25}
(4) {1, 1,3,3,7)

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

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) = .

If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 165-pound man? 1.0 kg ca 5.1 kg ca 1.0 x 102 kg ca 5.1 x 102 kg ca