Hi i have problem to solve this question can anyone help me? it is related to statistic

QUESTION 6 A producer of extruded plastic products finds that his mean daily inventory is 1,250 pieces. A new marketing policy has been put into effect and it is of interest to test that the mean daily inventory is still the same. A sample of daily inventories from eight randomly selected days give the following data. 1243 1240 1253 1249 1240 1256 1246 1260 Test at 1% significance level the hypothesis that the mean daily inventory remains unchanged despite the implementation of the new policy. Assume that the data are normally distributed