Transversal problems with equations

Assume that the weight of cereal in a “12.6- ounce box” is n(μ, 0.22). the food and drug association (fda) allows only a small percentage of boxes to contain less than 12.6 ounces. we shall test the null hypothesis h0: μ = 13 against the alternative hypothesis h1: μ < 13. (a) use a random sample of n = 25 to define the test statistic and the critical region that has a significance level of α = 0.025.