you purchase 9.25 gallons of gasoline at $3.15/gallon. you also buy gum ($1.10) and windshield wiper fluid ($4.97). the state has a food tax of 4% and you give the clerk $30.00 cash. you pay the rest with your debit card. how much is charged to your debit card?

a) $35.21
b) $5.21
c) $35.25
d) $5.25

The ages of personnel in the accounting department of a large company are normally distributed with a standard deviation of 7 years. there is a 0.02275 probability that the age of any randomly chosen person in the department is less than 22 and 0.15866 probabilty that the age of any randomly chosen person is greater than 43. what is the mean of this distribution?