2. Gary Trust wrote an article on Billboard. com about the lengths of hit songs, and identified that the mean length of all Billboard Hot 100 top 10 songs in the year 2019 was 3 minutes and 7 seconds (187 seconds), with a standard deviation of
61 seconds. The lengths of these songs follow an approximately Normal distribution
a. The Lil Nas X song "Old Town Road' was the shortest #1 hit since 1965, with a running time of 1 minute and 53
seconds (113 seconds). What is the percentile rank for "Old Town Road"?
[6 pts)

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

According to the data set, where should the upper quartile line of the box plot be placed?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.