A company produces light bulbs that have a mean duration of 800 hours with a standard deviation of 40 hours and a significance level of 0.04; Test the null hypothesis that u = 800 hours, in the circumstances that the alternative hypothesis is u = 800 hours, if a random sample of 30 light bulbs has an average life of 788 hours a) the null hypothesis is rejected, the bulbs have an average duration of 788 hours b) the alternative hypothesis is rejected, the ampoules have a duration of WWWww less than 788 hours c) the null hypothesis is accepted, the bulbs have an average duration of 800 hours d) the alternative hypothesis is accepted, the bulbs have a duration of less than 800 hours e) None of the above