00:01
So, to solve this problem, we will use the formula to find the z value and hence the probability from that.
00:07
So, this will be the value x minus mu divided by standard deviation divided by square root of n.
00:14
Now, x will be the value of interest for us and mu is the population mean, sigma is the population standard deviation.
00:23
So, this is 100 and n is 90.
00:27
Now, for the first one for evidence based reading and writing, we have to do it within 10 points of the mean.
00:37
So, the mean for evidence based writing in this is 533.
00:43
So, x values basically we need to find the values of x between 543 and 523.
00:51
So, this will be equal to probability of x is equal to 543 less than or equal to 543 minus probability of x less than or equal to 523, ok.
01:09
So, for both of this we will find the z value.
01:12
So, z will be equal to 543 minus 533 divided by 100 divided by square root of 90...