maths

1. Researchers collected data on the ages of people who died due to cardiac arrest over a 1-

year period. The distribution of the ages is normal, and the mean age was 60, with a

standard deviation of 6.

A) What percentage of people who died was between the ages of 57 and 64?

B) What percentage of people who died were older than 69?

2. The average age of licensed drivers in a country is musigma, and the distribution is approximately normal. A county police officer was interested in whether

the average age of drivers receiving parking tickets differed from the average age of the

driving population. She obtained a sample of N= 25 drivers receiving parking tickets. The

average age of these drivers was M=39.5. Perform the six steps of hypothesis testing

necessary to dtermine whether this group differs from the population of drivers in the

county.

3. Calculate the 90% confidence interval for the following fictional data regarding daily TV

viewing habits: muhours;sigma 1.3 hours; sample of 78 people with a mean of 4.1

hours