00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In the question here we are going to discuss about the central limit theorem.
00:12
It says that even the n greater equal to the 30, the sum of mean x -pal will be approximate to the normal.
00:19
In such a way that if we turn the x -bound we minus the mean of a standard deviation, devaluous code to end, we obtain the standard normal.
00:27
In the question here, we're given the mean equal to the 26th, the sigma equal to the 5 and the n equal to the 40 so it's greater than 30 already the question asks me to find the probability that the sum of mean x bar will be greater than the 25 .4 now to find this probability i need to convert the xx by the z by applying this formula then we will have the probability of the 25 .4 and minus the mean 26 divided by the standard division 5, over square the end 40.
01:04
And if we compute it, we will have the z could be greater than 25 .4 minus 26, divided by 5 times squared the 40, equal to the minus 0 .7, d6...