A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 753 hours. A random sample of 21 light bulbs has a mean life of 724 hours. Assume the population is normally distributed and the population standard deviation is 55 hours. At a= 0.02, do you have enough evidence to reject the manufacturer's claim? Complete parts (a) through (e). (a) Identify the null hypothesis and alternative hypothesis. O A. Ho: H 2 753 (claim) O B. Ho: H > 753 O C. Ho: us 724 Ha: H 724 (claim) O D. Ho: H = 724 O E. Ho: H