For a normal distribution, what percentage of values lies within two standard deviations of the mean?

a. 99.7%

b. 97%

c. 68%

d. 95%

What is the volume of the water in a fish tank that is 90 cm by 55 cm if it is filled to a height of 32 cm?

Zachary can't believe how bad London's traffic is today. In the past 10 minutes, his cab has barely moved 500 meters! He wonders if walking would have been faster.

Solve for c, 3ab-2bc=12

Tom collects black and white model cars. he has 72 in all. he has eight more than three times as many black ones than white ones. how many black cars does tom have in his collection

What is the correct algebraic expression of the following statement? The quotient of two consecutive positive integers with the largest number as the numerator. x/1 (x + 1) / x 1/x x / (x + 1)

What is the value of an annuity due at the end of 15 years of quarterly deposits of $2,000.00 with terms of 8 percent compounded quarterly? $228,102.00 $228,120.00 $232,666.08 $232,665.14

Is 2.22 a irrational or a rational number

Find the output, y, when the input, x, is 30. y = 14 - 0.5x

Let's say that you want to paint a room in your house. The room has rectangular walls. Each wall is 8 feet high. Two of the walls are 15 feet long, and the other two walls are 12 feet long.

Thirty students volunteered to set up booths for the school fair. All of the students worked 2 hours after school on Thursday and on Friday. Twelve of them also worked 3 hours on Wednesday.