The estimated daily living costs for an executive traveling to various major cities follow.

The estimates include a single room at a four-star hotel, beverages, breakfast, taxi fares, and incidental costs.

City Daily Living Cost

Bangkok ................242.87

Bogota ..................260.93

Cairo ..................194.19

Dublin.................260.76

Frankfurt ................355.36

Hong Kong .................346.32

Johannesburg ..............165.37

Lima ..................250.08

London .................326.76

Madrid .................283.56

Mexico City ................212.00

Milan ..................284.08

Mumbai ..................139.16

Paris ..................436.72

Rio de Janeiro ..............240.87

Seoul ...................310.41

Tel Aviv .................223.73

Toronto ..................181.25

Warsaw .................238.20

Washington, DC .............250.61

a. Compute the sample mean.

b. Compute the sample standard deviation

c. Compute a 95% confidence interval for the population standard deviation