Normal Review (7.1 & 7.2)

Which normal curve appears to have the largest standard deviation?

• a
• b
• c
• d

Which normal curve appears to have the lowest mean?

• a
• b
• c
• d

Estimate the mean of curve "a"

The mean value of land and buildings per acre from a sample of farms is $1500, with a standard deviation of $200. Estimate the percent of farms whose land and building values per acre are between $1300 and $1700.

• 68%

• 34%

• 0.68

• 0.34

The mean value of land and buildings per acre from a sample of farms is $1500, with a standard deviation of $200. Estimate the percent of farms whose land and building values per acre are less than $1100.

• 2.14%
• 2.27%
• 15.86%
• 0.13%

Find the indicated area under the normal curve. Round your answer to the nearest ten-thousandths place.

Find the indicated area under the normal curve. Round your answer to the nearest ten-thousandths place.

Find P(z > 0.67) using the standard normal distribution. Round your answer to the nearest ten-thousandths place.

Find P(-1.05 < z < 0.67) using the standard normal distribution. Round your answer to the nearest ten-thousandths place.

Assume the random variable x is normally distributed with a mean μ = 500 and a standard deviation of σ = 150. Find P(x < 427) Round your answer to the nearest ten-thousandths place.