An online store receives customer satisfaction ratings between 0 and 100, inclusive. In the first 10 ratings
the store received, the average (arithmetic mean) of
the ratings was 75. What is the least value the store
can receive for the 11th rating and still be able to
have an average of at least 85 for the first 20 ratings?

answer: given that the roller coaster can accommodate 1600 riders per hour, thus the roller coaster can accomodate 1600 / 60 = 26.67 riders per minute.

given that there are 345 people in the line, the number of minutes it will take for the 345 persons to get into the roller coaster is given by 345 / 26.67 = 12.94 minutes.

therefore, it will take you 12.94 minutes to get to the front of the line.

step-by-step explanation:

correct answers below: