Hi,

CI	z -value

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576

mean of 2.45 and a standard deviation of 0.25

ME = 1.96(.25/(49)

CI: 2.45-ME < u <  2.45 + ME 

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