00:01
In this question here we have to find out the probability.
00:04
So let's come to the first one.
00:08
So in first one we have to find out the probability for, so probability of x less than are equal to 30.
00:16
So now we can write this one as so probability of x less than 30 plus 0 .5.
00:25
By using continuity correlation.
00:30
So here, which is equal to so probability of x minus mu divided by sigma which is less than 30 .0 .5 minus 20 divided by square root of 18.
00:48
And now so probability of, so this is equal to z and less than this whole value which is equal to 2 .47.
01:00
And from the z table, this value is equal to.
01:04
0 .9932.
01:09
So which shows the probability value for a question.
01:14
And now let come to the b question.
01:18
In b question, we have to find out the probability for probability of x less than 30.
01:27
So now we can write this one as probability value, which is less than 30 value, so that probability of x less than are equal to 29...