please i need help with this one

please don't use excel or google sheet use an actual equation

9.1.2) The mean pull-off force of a connector depends on cure time (a) State the null and alternative hypotheses used to demonstrate that the mean pull-off force is more than 20 newtons. (b) Assume that the previous test does not reject the null hypothesis. Does this result provide strong evidence that the mean pull-off force is less than or equal to 20 newtons? (c) Assume that the previous rejects the null hypothesis. Does this result provide strong evidence that the mean pull-off force is more than 20 newtons