in the Standard Normal distribution: (a) 2.09% of z-scores are less than z=z= (b) 17.79% of...

in the Standard Normal distribution:

(a) 2.09% of z-scores are less than z=z=

(b) 17.79% of z-scores are greater than z=z=

In each case, round your answers to at least two decimal places.

Among smartphone owners 26-35 years of age, the average number of text messages sent per day follows an approximately Normal distribution with a mean of 66 and a standard deviation of 2.

(a) What percent of smartphone owners 26-35 years of age sent an average of more than 63 text messages per day?
(b) Fill in the blank: Approximately 30 percent of smartphone owners 26-35 years of age sent an average of less than text messages per day?

(c) Fill in the blank: Approximately 5 percent of smartphone owners 26-35 years of age sent an average of more than text messages per day.

Expert Solution

orchestra answered 2 years ago

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