00:01
Hi, i'm david and i'm here to have you answered 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 normal distribution.
00:09
Let me remind you that if the x not follows by the normal, when the mean and a standard deviation, if we think the x will minus the mean of a standard deviation, but if we think the sum of mean x bar will minus the mean of standard deviation, we need to divide extra squared up that end, you know that you obtain a standard normal.
00:30
In this question here we have the written speed x, it will follow by the normal, with the mean it will equal to the 89, 10th deviation equal to the 10.
00:43
And in the question a, when you find the probability that a random student x with the speed reading will be more than the 95.
00:55
And to find this probability, we need to convert the x into the z.
00:58
To do it, i need to apply this formula here and then i will have the 95 and minus the mean divided by the standard deviation and if we compute we have the z will be greater than 95 minus 89 divided by 10 equal to the 0 .6...