The amount of daily time that teenagers spend on a brand A cell phone is normally distributed with a given mean Mu = 2.5 hr and standard deviation Sigma = 0.6 hr. What percentage of the teenagers spend more than 3.1 hr? 5% 10% 16% 32%

Question

Kaitlyn Walker

Mathematics

20 January, 13:23

The amount of daily time that teenagers spend on a brand A cell phone is normally distributed with a given mean Mu = 2.5 hr and standard deviation Sigma = 0.6 hr. What percentage of the teenagers spend more than 3.1 hr? 5% 10% 16% 32%

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Answers (2)

Know the Answer?

Joslyn Sawyer · Answer 1

Joslyn Sawyer 20 January, 13:30

0

16

Step-by-step explanation:

right

Malia Hamilton · Answer 2

Option 3./C. 16%

Step-by-step explanation:

First, we get the z-score by using the equation,

Standard deviation Substituting,

= 1

Z-score = value - mean/

Z-score = (3.1 - 2.5) / 0.6

Converting the z-score to percentage will give us 0.841. Subtracting this value from 1.0 and multiplying The difference by 100%.

Percentage = (1 - 0.0841) x 100%

= 15.9% Thus, 15.9% of the teenagers spend more time In the cellphone.

Didn't you finally want to round it out,

And you get 16%