ALEKS Statistics and Probability 3

Question 1

A data set has mean 50 and standard deviation 5. What percentage of data falls within one standard deviation of the mean (using the empirical rule)?

Accepted Answer

68%

Answer

95%

Answer

99.7%

Answer

50%

Question 2

What is the probability of two independent events both occurring if P(A) = 0.4 and P(B) = 0.5?

Accepted Answer

0.20

Answer

0.90

Answer

0.45

Answer

0.80

Question 3

Which value represents the middle 50% of a data set in a box plot?

Accepted Answer

Interquartile range (IQR)

Answer

Mean

Answer

Standard deviation

Answer

Range

Question 4

A survey of 200 people found 60 prefer brand A. What is the relative frequency of brand A preference?

Accepted Answer

0.30

Answer

0.60

Answer

60%

Answer

30/100

Question 5

What is the probability of NOT rolling a 6 on a fair die?

Accepted Answer

5/6

Answer

1/6

Answer

4/6

Answer

1/3

Question 6

In a stem-and-leaf plot, which part represents the ones digit?

Accepted Answer

Leaf

Answer

Stem

Answer

Median line

Answer

Title