Question

Hwill sec 6.2 Previous 2 3 45 Next Question 3 of 5 (1 point) View problem in a pop-up For a certain group of individuals, the average heart rate is 73 beats per minute. Assume the variable is normally distributed and the standard deviation is 2 beats per minute. If a subject is selected at random, find the probability that the person has the following heart rate. Round the final answers to four decimal places and intermediate z-value caleulations to two decimal places. 6.2 Section Exercise 15a, b, c Question Check Ans Solve It Guided Sol Show Exar Ask My Instr Link to Texth Part 1 Between 70 and 74 beats per minute. P(70<X < 74)=10.6247 Part 2 out of 3 Higher than 72 beats per minute. Save for La P(X>72)-ㄈ ㄧㄧ Submit Assignme NEXT MacBook Pro

part 2

Answer 1

2)

Define the standard random varaible Z as $Z={X-73\over 2}$ Where X is the heart beat rate

Then for X=72, $Z={72-73\over 2}=-0.5$

Hence using normal table we get

$P(X>72)=P(Z>-0.5)=0.6915$