In a research sample of highschool students, the variable “number of fb friends” formed a normal distribution with a mean of 45 and a standard deviation of 16. valentina had 53 friends. what was her approximate percentile rank?
a) 31st
b) 53rd
c) 69th
d) 49th

|p| > 3 {-3, 3} {p|-3 < p < 3} {p|p < -3 or p > 3}

Determine whether the question is a statistical question. explain. 1. what is the eye of sixth grade students? 2. at what temperature (in degree fahrenheit) does water freeze? 3. how many pages are in the favorite books of students your age? 4. how many hours do sixth grade students use the internet each week? you!

Walgreens sells both kleenex and nyquil. in a random sample of 5000 purchases, it was found that 1200 contained kleenex and 540 contained nyquil. these are not independent because sick people are more likely to buy both and healthy people more likely to buy neither. in looking into that, it was found that 360 purchases contained both. a. make a two-way table to display this information. fill in the table with the missing entries, and be sure your table has row and column totals. b. if we randomly select a purchase that contained kleenex, what is the probability it also contained nyquil? c. what percent of all purchases didn’t contain either product?