19.People spend an average of 4 hours per day on their computers with a standard deviation of 0.75 hour.What proportion spends at least 5.25 hours per day on their computers?Write a sentence that states your findings.Round to two decimal places.

20. Roadworthy tires last an average of 30,000 miles with a standard deviation of 2500 miles.What proportion of these tires last 28,000 miles or less? Round to two decimal places.

21. Birth weights of newborns are normally distributed with a mean of 7.5 pounds and a standard deviation of 1.2 pounds.In what percentile is a 6 pound newborn?(round to nearest percentile)

22. SAT Math scores are normally distributed with a mean of 500 and a standard deviation of 100.If a student scores 710, what percentile are they in?(round to nearest percentile) Explain your answer in a meaningful sentence.