Mathematics
Mathematics, 11.10.2019 01:00, tejasheree

Consumer reports uses a 100-point customer satisfaction score to rate the nations major chain stores. assume that from the past experience with the satisfaction rating score, a population standard deviation of 12 is expected. in 2012, costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. a sample of 15 costco customer satisfaction scores follow:

95 90 83 64 95
98 80 83 82 93
86 80 94 75 62
(a) what is the sample mean customer satisfaction score for costco?
(b) what is the sample variance?
(c) what is the sample standard deviation?

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