00:01
In this video, our objective is to find what is the minimum red blood cell count that can be in the top 25 % of the counts.
00:08
And in the information that we are given with is mu, which is mean is equals to 5 .4, standard deviation of sigma is equals to 0 .4.
00:17
And here we are assuming that let x be the random variable that denotes the blood cell count, the red blood cell count.
00:55
So, also, x is the normal distribution with parameters mu and sigma.
01:04
Now, coming on to the next solution, so here we need to find the x not when p is probability of capital x is greater than x0 is equal to 0 .25.
01:25
So probability of capital x, we can say that.
01:31
Probability of capital s is greater than x not is equals to 0 .25.
01:40
Also, it can be written as 1 minus probability of x, capital x to be less than x0 is equals to 0 .25.
01:53
So, probability of capital x to be less than x0 is equal to 1 minus 0 .25.
02:03
So, solving this ahead, this is equals to 0 .75 by solving this...