The prices in dollars for a graphing calculator are shown, Ask an Expert

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The prices in dollars for a graphing calculator are shown below for 8 online vendors. Estimate the population standard deviation in price with 90% confidence.

148 133 136 152 140 143 129 139

A) 5.4 < symbol < 13.7

B) 6.4 < symbol < 12.3

C) 7.1 < symbol < 10.3

D) 7.3 < symbol < 7.9

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