**Question 1 Correct Mark 1.00 out of 1.00**

**Provide an appropriate response.**

Find the area of the shaded region. The graph depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test).

**Question** **2 Correct Mark 1.00 out of 1.00**

**Provide an appropriate response.**

Find the area of the shaded region. The graph depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test).

**Question** **3 Correct Mark 1.00 out of 1.00**

**Provide an appropriate response.**

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Find the probability that a randomly selected adult has an IQ between 90 and 120 (somewhere in the range of normal to bright normal).

**Question** **4 Correct Mark 1.00 out of 1.00**

**Assume that X has a normal distribution, and find the indicated probability.**

The mean is μ = 60.0 and the standard deviation is σ = 4.0.

Find the probability that X is less than 53.0.

**Question** **5 Correct Mark 1.00 out of 1.00**

**Assume that X has a normal distribution, and find the indicated probability.**

The mean is μ = 15.2 and the standard deviation is σ = 0.9.

Find the probability that X is greater than 15.2.

**Question** **6 Correct Mark 1.00 out of 1.00**

**Assume that X has a normal distribution, and find the indicated probability.**

The mean is μ = 15.2 and the standard deviation is σ = 0.9.

Find the probability that X is between 14.3 and 16.1.

**Question** **7 Correct Mark 1.00 out of 1.00**

**Find the indicated probability.**

The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?

**Question** **8 Correct Mark 1.00 out of 1.00**

**Find the indicated probability.**

The incomes of trainees at a local mill are normally distributed with a mean of $1100 and a standard deviation of $150. What percentage of trainees earn less than $900 a month?

**Question** **9 Correct Mark 1.00 out of 1.00**

**Find the indicated probability.**

The diameters of pencils produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What is the probability that the diameter of a randomly selected pencil will be less than 0.285 inches?

**Question 10 Correct Mark 1.00 out of 1.00**

**Find the indicated probability.**

The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a pregnancy lasts at least 300 days?