Let x be a random variable that represents the length of time it takes a student to write a history paper. It was found that x has an approximately normal distribution with mean μ = 7.5 hours and standard deviation σ = 1.8 hours. Do not round your final answers! a. What is the probability that it takes at least 6 hours for a randomly selected student to write a history paper?

The probability is:

b. What is the probability that the mean time of writing a history paper for a random sample of 16 students is at most 7 hours?

The probability is:

did you get the answer yet?

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.

$3720

step-by-step explanation:

taxable income = $31000

as per the 2018-2019 us tax bracket, the tax rate is 12% for an individual whose taxable income is between $9,526 to $38,700.

so, the tax to be paid by him = 12% of 31000

= 0.12 * 31000     [12% converted to decimal as 0.12]

= $3720

none of these

step-by-step explanation:

23 + 34 add up to 57 so just inform the teacher of this really stupid mistake