Sophia Statistics Unit 2 Milestone, Latest Questions and Answers with Explanations, All Correct Study Guide, Download to Score A

UNIT 2 — MILESTONE 2

Score 22/26

You passed this Milestone

22 questions were answered correctly.

4 questions were answered incorrectly.

1

The manager went over the sales of mobile phones at the store and found that the mean sale was 45, with a

standard deviation of 4. On a particular day, 52 mobile phones were sold.

What is the z-score of the sale of mobile phones on that day?

-28

28

1.75

-1.75

RATIONALE

Recall that the z-score can be calculated with the following formula:

The given value is 52 phones, the mean is 45 phones, and the standard deviation is 4 phones. Plug these values

in to get the following z-score:


This also tells us that 52 is 1.75 z-scores or standard deviations above the mean.

CONCEPT

Standard Scores and Z-Scores

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2

In a poll of 300 preschoolers, 125 said they preferred chocolate ice cream, 71 said they preferred vanilla, 100

said they preferred cookies & cream, and 4 said they had never eaten ice cream.

If a pie chart were to be made showing the preference for each flavor, the central angle for the chocolate

ice cream sector would be __________.

41°

150°

124°

RATIONALE

Recall that to get the angle for something in a pie chart we use the following formula:

So in this case, the central angle for the chocolate ice cream sector would be:

CONCEPT

Bar Graphs and Pie Charts

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3

open parentheses fraction numerator v a l u e over denominator t o t a l space v a l u e end fraction

close parentheses times 360 degree


The first quartile (Q1) value from the above box plot is __________.

47

40

65

54

RATIONALE

Note the value for Q1 is the left edge of the box, which is 47.

CONCEPT

Five Number Summary and Boxplots

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4

Select the statement that accurately describes unimodal distribution.

A distribution in which two distinct values are more frequent than the other values.

A distribution in which the values are distributed uniformly.

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