Chapter 6 - AP Stats - Probability

Again, assume the test scores follow the model N(82,5). What % of the scores are between 80 and 90?

• 50%

• 60%

• 70%

• unable to determine

What % of the area in a Normal curve is within 1 standard deviation of the mean?

• 50%

• 68%

• 95%

• 99.7%

What % of the Normal curve is greater than 1 standard deviation above the mean?

• 68%

• 34%

• 16%

• 5%

Again, assume the test scores follow the model N(82,5). What score would equate to z = 1.6?

• 90

• 83.6

• 87.6

• 74

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

• A

• B

• C

• D

• E

Is this a probability distribution?

• No

• Yes

Again, assume the test scores follow the model N(82,5). What percent of the scores fall below 82?

• 68%

• 50%

• 34%

• 95%

Again, assume the test scores follow the model N(82,5). What percent of the students scored below a 75?

• 8%

• 5%

• less than 1%

• 1.4%

Again, assume the test scores follow the model N(82,5). What scores would put you in the top 10% of scores?

• 92 or higher

• 88.4 or higher

• 75.6 or higher

• 90 or higher