Lisa has collected data To find That the number of pages per book on a book shelf has normal distribution. What is the probability that a randomly selected book has fewer than 153 pages of the mean is 193 pages and the standard deviation is 20 pages? Use the empirical rule

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

In the 30-60-90 triangle below side s has a length of and side r has a length

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.