Based on a survey of 32 randomly selected employees (anonymously, of course) the company has determined that the average amount of time spent texting over a one-month period is 173 minutes with a standard deviation of 66 minutes. what is the probability that the average amount of time spent using text messages is more than 199 minutes

0.0129

Step-by-step explanation:

Given : Sample size : n=32

The average amount of time spent texting over a one-month period is  :

Standard deviation :

We assume that the time spent texting over a one-month period is normally distributed.

z-score :

For x=  199

Now by using standard normal table, the probability that the average amount of time spent using text messages is more than 199 minutes will be :-

Hence, the required probability = 0.0129

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10