The Tax Bureau claims that people typically take 140 minutes to fill in a tax form. A researcher believes that this claim is incorrect and that, generally, it takes people longer to complete the form. She recorded the time (in minutes) it took ten people to complete the form. The results are given below.

Carry out a sign test, at the 5% significance level, to investigate whether the average time to complete the form is greater than 140 minutes.

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151 138 132 149 145 152 141 148 162 146