00:01
Hey there, welcome to numerade.
00:03
We are asked to find the probability that axis between 69 and 77 beats per minute.
00:10
So we're looking at the heart rate here, given population mean and population standard deviation, following a normal distribution.
00:19
So let's write these values down.
00:21
We have our mean that equals 74 beats per minute, and we have our standard deviation.
00:39
That equals around 4.
00:46
Alright, so we have standard deviation equals 4 and the mean equals 74 over here.
00:54
So the probability that we're asked to find here is the probability that x is between 69 and 77.
01:07
So therefore, we can find this probability by splitting this into two parts.
01:12
The probability that x is less than 77.
01:17
Minus the probability that x is less than 69.
01:21
All right, so we have less than 77 and less than 69 over here.
01:31
So let us find the z scores for both of these probabilities here.
01:38
So let's separate this...