This question says what percentage of plot yields were 85 lbs or more. Just to clarify this is not asking for percentile correct? Do you know where I could find an example of how we did this in class? Thank you!
Think about the way we defined the random variable, Y.
Then, you would realize all the questions in #3 are essentially similar things with different cutoffs.
Page 3 and 4 of THIS is the most similar examples.