Question

QUESTION 19 Find the variance for the given data. Round your answer to one more decimal place than the original data. 77251 A7.8 D.6.2 QUESTION 20 Find the variance for the given data. Round your answer to one more decimal place than the original data. The weights (in ounces) of 10 cookies are shown 1.4 0.99 1.37 0.58 0.68 0.57 1.1 0.96 1.2 1.27 O A 0.098 oz o B.0.074 oz o C0.088 oz2 o D0.08 oz4

Answer 1

Formula of variance is 1/n Sigma^n_i = 1 (x_i - x^-)^2 Let's make table x^- = Sigma^n_i = 1 x_i/n = 7 + 7 + 2 + 5 + 1/5 = 22/5 = 4.4 therefore Sigma^5_i = 1 (x_i - x^-)^2 = 31.2 therefore var(x) = 1/5 Sigma^5_i = 1 (x_i - x^-)^2 = 31.2/5 = 6.24 therefore correct option is 6.2 [D] x^- = 1/10 Sigma^n_i = 1 x_i = 10.12/10 = 1/012 Sigma^n_i = 1 (x_i - x^-)^2 = 0.88376 therefore var(x) = 1/10 0.88376 = 0.088376 therefore correct answer after rounding is c rightarrow 0.088 oz^2