Question
The mean number of text messages sent per month by customers of a cell phone service provider is 1,350, and the standard deviation is 750
The mean number of text messages sent per month by customers of a cell phone service provider is 1,350, and the standard deviation is 750. Find the z-score associated with each of the following numbers of text messages sent. (Round your answer for part (b) to three decimal places.)
(a) 0
(b) 11,000
(c) 4,500
(d) 300
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Koala Tutor
Koala Ai Support
Got a question with my answer?
To find the z-score, we use the formula:
z = (x - μ) / σ
where z is the z-score, x is the number of text messages sent, μ is the mean, and σ is the standard deviation.
(a) 0:
z = (0 - 1350) / 750
z = -1.8
(b) 11,000:
z = (11000 - 1350) / 750
z = 14.2
(c) 4,500:
z = (4500 - 1350) / 750
z = 4.2
(d) 300:
z = (300 - 1350) / 750
z = -0.6
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