The number of pages per book on a bookshelf is normally distributed with mean 189 pages and standard deviation 20 pages. What is the probability that a randomly selected book has greater than 229 pages? Use the empirical rule. Provide the final answer as a percent rounded to one decimal place

correct answer:

b.(19,-2)

ratio is 2 : 9

the answer is three

13.5 : 3

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet