00:01
To solve this problem, we have been given mean mu equal to 52 ,950 and standard deviation sigma equal to 4 ,370.
00:21
So in part a, we need to find probability where x is greater than 55 ,000, that is equal to p.
00:41
Divided by sigma is greater than 55 ,000 minus 52 ,950 divided by 4 ,370.
01:03
So it is equal to p z is greater than 0 .4691.
01:19
The value is 0 .3192.
01:29
From normal probability table.
01:51
So the answer is p x is greater than 50 ,000, 55 ,000 is equal to 0 .3192.
02:11
So this is the answer of part a.
02:16
In part b we need to find p where x is greater than 55 ,000 and less than 57 ,000, and less than 57 ,000...