A particular brand of dishwasher soap is sold in three sizes: 30 oz, 40 oz, and 70 oz. Twenty percent of all purchasers select a 30-oz box, 50% select a 40-oz box, and the remaining 30% choose a 70-oz box. Let X1 and X2 denote the package sizes selected by two independently selected purchasers. a) Determine the sampling distribution of X. Calculate E(X). b) Determine the sampling distribution of the sample variance S2. Calculate E(S2).

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

the ratio of grapes to blueberries she should use is 12: 3

step-by-step explanation:

if mandie is making 15 cups of fruit salad, the ratio of grapes to blueberries she should use is 12: 3.

the answer is 13 cm

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2