With the growing life style of people drinking coffee, it is found that in recent years about

two-thirds of Indonesian households purchased ground coffee. It is known that the monthly expenditure

for household purchasing ground coffee is normally distributed with a mean of Rp65,000.00 and a

standard deviation of Rp10,000.00.

a. Explain the characteristics of the normal distribution! (5 points)

b. Find the probability that a household spends less than Rp 35,000.00 (5 points)

c. 99% of the households spend less than what amount? (7 points)

d. What is the lower and upper limits of the interval that contains 95% of the monthly

expenditures that are in the middle of the distribution of expenditures for ground coffee? (8

points