00:01
In this question, given that the x values and its corresponding probability distribution is given, that is x values are 300, 400, 500, 600, 600 and its corresponding probability distribution is 0 .2, 0 .3, 035 and 0 .15.
00:27
Here we have to find the standard deviation 4.
00:33
So for this, we have standard deviation is square root of variance.
00:40
So, variance of x is, expectation of x squared minus expectation of x the whole square.
00:50
So the expectation of x is summation x into p of x, that is 300 into point.
01:02
Plus 400 into 0 .3 plus 500 into 0 .35 plus 600 into 0 .15.
01:19
So we get the answer is 445...