21 A pump can be set to extract water from a pool at one
of three different rates:1 gallon per minute.
4 gallons per minute, or 8 gallons per minute. The
graph below shows the amount of water left in the
pool from the time the pump was turned on. How
many minutes after being turned on was the pump
switched to a rate of 8 gallons per minute?

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?