The mean number of words per minute (WPM) typed by a speed typist is 135 135 with a variance of 100 100 . What is the probability that the sample mean would be greater than 135.7 135.7 WPM if 43 43 speed typists are randomly selected

And we can find this probability with this way:

Step-by-step explanation:

For this case w ehave the following info given:

represent the sample mean

represent the sample variance

represent the deviation

represent the sample mean selected

For this case we want to find the following probability:

And since the sample size is large enough we can use the following distribution for the sample mean:

And we can use the z score formula given by:

And we can find the z score for the value 135.7 and we got:

And we can find this probability with this way:

answer: a and b

step-by-step explanation: