In 2006, 95% of new cars in the US came with a spare tire. In 2017, 72% came with a spare tire. Suppose a researcher takes separate random samples of 250 cars made in each year, then looks at the
difference between the sample proportions P2006 - P2017 of cars with spare tires in each sample.
What are the mean and standard deviation of the sampling distribution of P2006 - P2017?

Choose 1

A. mean of P2006-P2017: 57.5

Standard Deviation of P2006-2017: Square root of .95(.05)/250 + .72(.28)/250

B C and D in picture

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.

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