A computer repairer believes that the mean repair cost for damaged computer is more than $95 ...

     A computer   repairer believes that the mean repair cost for damaged computer is more than   $95. To test this claim, you determine the repair cost for 7 randomly   selected computers and find that the mean repair cost is $100 per computer   with standard deviation of $42.50. At a=0.01, do you reject null or not. my   choices are reject null, fail to reject null, reject null and alternate.