The manager of a pub takes a random sample of 12 tables served during the course of an evening and records the total value of the cheque for each table:

76

62

71

78

67

53

52

64

47

70

25

37

T-Distribution Table

a. Calculate the sample mean and standard deviation.

x=x=

Round to the nearest cent

s=s=

Round to the nearest cent

b. Construct a 95% confidence interval for the mean value of the cheque per table that evening.

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Round to the nearest cent