00:01
So let's do the statistics problem, but before i get started, i recommend that you do the question yourself and come back to see if you cut it right or not.
00:10
So hopefully we've done the question yourself.
00:11
Now let's do it together.
00:12
So we're given that memberships and mensa, they're required iq of at least 131 .5.
00:19
And we're given that the data or the iq scores are normally distributed with a mean of 100 and standard deviation 15.
00:29
So we're going to take that.
00:37
And then we're asked for the first question, if one person is randomly selected from the general population, what is the probability that their iq score would be at least 131? so whenever you see the word at least, you have to think about, it says at least 133.
00:58
So that is saying that the minimum score, the minimum score here is 131.
01:05
So it would be any number.
01:06
That is greater to or equal to 133.
01:10
And then we're given it's one person, so we don't have to do any crazy calculations, or we don't have to involve the sample size yet.
01:23
So that means that our z score is going to look like this...