00:01
For this question, they're given the mean value, which is 6 .5, and they're given the other values here.
00:09
So what do we have to do here? in order to get the mean value, you have to just add up all the values and divide by the number of terms.
00:17
So the mean, let me just write the formula, so the mean, which is equal to the sum of all values and divide by the number of terms.
00:27
So in this case, the mean value is given as 6 .5 and is equal to, and the sum of the values here.
00:35
So we don't know the value for lesson d.
00:40
Let's say the sum of the four lessons is 25 or something else.
00:45
Let's say this is 25, point, let's say this is 25.
00:53
And what about the d lesson? so i'm going to just add the d lesson here and divide by 5 here, so we will get the mean value...