Afast food restaurant serves cheese burger that is supposed to have 400 calories. A food inspector reports, based on a sample of 81 burgers, that burgers contain more than 400 calories. The sample mean was found to be 500 calories and sample standard deviation was found to be 300. Assume = .01

a.

the null hypothesisis that population mean is more than 400

b.

the food inspector is correct

c.

Reject the alternate hypothesis

d.

Not enough information is given to do hypothesis testing