Hen 14 different second-year medical students at bellevue hospital measured the systolic blood pressure of the same person, the sample mean was 134 mmhg. assuming that the population standard deviation is known to be 10 mmhg, use a .05 significance level to test the claim that the mean blood pressure is less than 140 mmhg. use our 4-step procedure.

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?