According to new jersey transit, the 8: 00 a. m. weekday train from princeton to new york city has a 90% chance of arriving on time on a randomly selected day. suppose this claim is true. choose 6 days at random. let x = the number of days on which the train arrives on time. 1. explain why this is a binomial setting.

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.