The Prices (In Dollars) for a Graphing Calculator Are Shown $5.4 < \sigma < 13.7$

Multiple Choice

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) $5.4 < \sigma < 13.7$
B) $7.3 < \sigma < 7.9$
C) $6.4 < \sigma < 12.3$
D) $7.1 < \sigma < 10.3$