Astudy was done to determine the average number of homes that a homeowner owns in his or her lifetime. for the 60 homeowners surveyed, the sample average was 4.2 and the sample standard deviation was 2.1. calculate the 95% confidence interval for the true average number of homes that a person owns in his or her lifetime.
a) (3.90, 4.50)
b) (3.66, 4.74)
c) (4.01, 4.39)
d) (3.67, 4.73)

D) (3.67, 4.73)

Step-by-step explanation:

Confidence Interval for the true average number of homes that a person owns in his or her lifetimecan be calculated using M±ME where

And margin of error (ME) can be calculated as

ME= where

Putting the numbers we get ME=≈0.53

Then the 95% confidence interval is 4.2±0.53 or (3.67, 4.73)

you never say the total so we cant find the percentage used for petrol

step-by-step explanation: