AP Stats Chapter 11

The number of absences during fall semester was recorded for each student in a large elementary school. The distribution of absences is displayed in the following cumulative relative frequency graph. What is the IQR for the distribution of absences?

• 1

• 2

• 3

• 5

• 1

About what proportion of the cockroaches will have weights greater than 83 grams?

• 0.0228

• 0.0668

• 0.1587

• 0.9332

• 0.0772

A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams. Based on this report, what is the approximate standard deviation of weight for this species of cockroaches?

• 4.6

• 5.0

• 6.2

• 4.0

• Cannot determine without more information

With a mean of 62 and standard deviation of 11

what is the probability of a value that is AT MOST 70

Round your answer to the nearest ten thousandth

(a)  

With a mean of 70 and standard deviation of 7,

what percentage of values fall between 56 and 84?

(a)  

Two measures of center are marked on the density curve shown. Which of the following is correct?

• The median is at the yellow line and the mean is at the red line.

• The median is at the red line and the mean is at the yellow line.

• The mode is at the red line and the median is at the yellow line.

• The mode is at the yellow line and the median is at the red line.

• .

  The mode is at the red line and the mean is at the yellow line.

Find the z-score

x = 36 μ= 42 σ = 5

• 0.74

• 1.2

• -1.2

• 1.03

Find the z-score

x = 19 μ= 14 σ = 2.1

Type in your answer to the nearest hundredth

(a)  

If the mean is 100 and the standard deviation is 5

What is the probability of having a value between 72 & 102?

• 0.3448

• 0.6554

• 0.0854

• 0.7132

If the mean if 100 and the standard deviation is 5

What is the probability of a value that is AT LEAST 95.

Type your answer to the nearest ten thousandth place

(a)