As a general rule, the normal distribution is used to approximate the sampling distribution of the sample proportion only if:a. the population proportion Π is close to 0.50.b. the underlying population is normal. c. the sample size n is greater than or equal to 30.d. nΠ and n(1-Π) are both greater than or equal to 5.

right

step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

explanation:

step-by-step explanation:

the height of the surface increases from the center out to the sides of the road

it is c!