I'm having a hard time understanding what problem 2 question 2 is asking me to do. Can anyone help me out? Question 3 is similar but I think I can figure it out with a little help here.
b) The proportion of observations from standard Normal distribution that takes values less than z = 1.15 is about
A. 0.8531
B. 0.1251
C. 0.8749
D. 0.2436
E. None of the above.
@Alison Using the notation that I typically write in class, this problem is asking you to find
$$P(X<1.15)$$
when $X$ is a standard normal. You can't do this using the rules of thumb we looked at in class today; you'll need to either
pnorm(1.15) should do the trick), or If you choose to use a table, use the one in the back of our book since the one in our class notes only contains data that's good up to one decimal place.
Finally, we will have an problem sheet in class tomorrow that goes over exactly this kind of question!