I am doubting my calculations.

Question 19 4 pts Pulse rates of adult men are approximately normal with a mean of 70 and a standard deviation of 8. Which of the followings correctly describes how to nd the proportion of men that have a pulse rate greater than 78? 0 Find the area to the left of z=-1 under a standard normal curve. 0 Find the area between z=-1 and 2:1 under a standard normal curve. 0 Find the area to the right of 2:1 under a standard normal curve. 0 Find the area to the left of 2:1 under a standard normal curve. Question 20 4 pts A survey for brand recognition is done and it is determined that 68% of consumers have heard of Dull Computer Company. A survey of 800 randomly selected consumers is to be conducted. For such groups of 800, would it be unusual to get 698 consumers who recognize the Dull Computer Company? Recall that we consider as unusual any result that differs from the mean by more than 2 standard deviations. That is, unusual values are either less than p1 25 or greater than ,u + 20-. Hint: Binomial Distribution. 0 Sometimes Yes, sometimes No and it depends. 0 Yes ONo Question 21 4 pts Suppose a normally distributed random variable x has a mean of 100 and P(x