He dow jones industrial average has had a mean gain of 432 pear year with a standard deviation of 722. a random sample of 40 years is selected. what is the probability that the mean gain for the sample was between 200 and 550? 0.001 0.191 0.998 0.828 flag this question

(question 19) 2 pts of all the companies on the new york stock exchange, profits are normally distributed with a mean of $6.54 million and a standard deviation of $10.45 million. in a random sample of 73 companies from the nyse, what is the probability that the mean profit for the sample was between 3.0 million and 6.0 million? 0.215 0.328 0.325 0.015 flag this question

(question 20) 2 pts doing research for insurance rates, it is found that those aged 30 to 49 drive an average of 38.7 miles per day with a standard deviation of 6.7 miles. these distances are normally distributed. if a group of 60 drivers in that age group are randomly selected, what is the probability that the mean distance traveled each day is between 32.5 miles and 40.5 miles? 0.900 0.981 0.429 0.917