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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
... [Show More] 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
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°
5°
124°
The first quartile (Q1) value from the above box plot is .
47
40
65
54
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.
A distribution in which one value is more frequent than other values.
A distribution in which numerous values are more frequent than other values.
Choose the statement that correctly describes a normal distribution.
Approximately 68% of the values are greater than the mean value.
The approximate percent of values lying within three standard deviations of the mean is 49.85%.
Approximately 68% of the values lie within one standard deviation of the mean.
The approximate percent of values lying within two standard deviations of the mean is 47.5%.
6
Sara wonders what percentage of her students answered at least half of the quiz questions incorrectly.
The relative cumulative frequency of students who earned a score of 20 or lower on the quiz is
.
68%
28%
34%
14%
7
Dave drives to work. While driving the car over nine days, he observes his daily average speed and lists it in the table below.
Day Average Speed
(MPH)
1 45
2 62
3 44
4 70
5 59
6 66
7 54
8 63
9 67
The median speed at which Dave drove to work was . [Show Less]