Ana is solving the problem -15 + 42 using colored tiles. She is using red tiles to represent negative numbers, and yellow tiles to represent positive numbers. After representing the expression, she removes all zero pairs from her mat. How many tiles will be on her mat at the end of the problem? What color will they be? A.
15 red tiles

B.
27 red tiles

C.
27 yellow tiles

D.
57 yellow tiles

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?

When 60% of a number is added to the number the result is 192 what is the bumber

The discrete random variables x and y take integer values with joint probability distribution given by f (x,y) = a(y−x+1) 0 ≤ x ≤ y ≤ 2 or =0 otherwise, where a is a constant. 1 tabulate the distribution and show that a = 0.1.2 find the marginal distributions of x and y. 3 calculate cov(x,y).4 state, giving a reason, whether x and y are independent. 5 calculate e(y|x = 1).