The function rule t(m)=450-8m represents the amount of water t(m) (in liters) in a holding tank after being drained at a rate of 8l/min for m minutes. how much time has passed if there are 274 l of water in the tank

a. 18 min
b. 20 min
c. 22 min
d. 24 min

if you can explain and work it out

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.