00:01
What percentage of customers will spend less than php 150 on concessions? so p of x less than 150 we are asked to find out.
00:15
So we know a z score because it is a normal distribution, right? so as the data is distributed normally we are assuming.
00:25
So, z score we need to find out so that we can easily find out the area covered by it or simply the probability which is x less than 150.
00:36
Z is given by x minus mu by sigma.
00:40
Right.
00:40
So, x is supposed to be 150 here.
00:43
Let me write for z less than it would be x would be 150 negative of mu.
00:50
What is mu? mu is going to be 205 .50.
00:58
205 .50.
01:00
This is whole divided by 68 .50.
01:05
Isn't it? this is what the equation is all about, right? let's calculate the z -score now.
01:11
It will be 150.
01:14
Okay, so this is the value of z basically...