Accepting or rejecting hypothesis. I don't understand this problem

A consumer electronics firm has developed a new type of remote control button that is designed to operate longer before becoming intermittent (the best remote control button on the market lasts an average of 1200 hours). A random sample of 36 new buttons is selected and each is tested in continuous operation until becoming intermittent. The resulting lifetimes of the buttons are recorded and found to have a sample mean of 1275 hours. 4pts a) What are the population, variable of interest / success, appropriate null hypothesis, and appropriate alternative hypothesis? Population: Variable of Interest / Success: Ho: Ha: 2pts b) Assume the standard deviation of the lifetimes of all new buttons is 210 hours. Determine the value of the appropriate test statistic to perform this test. 2pts c) Determine the value of the p-value for this test. 1pt d) Statistical conclusion: Accept or Reject (circle one) the null hypothesis AND WHY? Ipt e) Real Life Conclusion: Do you have enough evidence in the data to conclude that these new remote control buttons are better? Yes or No (circle one)