What is the estimated difference of 8 6/11 - 5 7/13? (⬅Those are mixed number fractions.) Giving brainliest to the correct answer

A) 4 1/2

B) 4

C) 3 1/2

D) 3

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?