Sarah is playing a game in which she rolls a number cube 20 times. the results are recorded in the chart below. what is the experimental probability of rolling a 1 or a 3? number on cube: 1,2,3,4,5,6 number of times event occurs: 3,6,1,5,3,2 a.0.2 b.0.3 c.0.6 d.0.83

For the function, f(x) = -5x 2, find f(-4).

The factorization of 8x3 -125 is (2x-5)(jx2 +kx+25)

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.