Score 22/26
You passed this Milestone
22 questions were answered correctly.
UNIT 2 — MILESTONE 2
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:
You passed this Milestone
22 questions were answered correctly.
UNIT 2 — MILESTONE 2
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:
