The mean of a data set is 5 and the standard deviation is 1.3. Every number in the set is multiplied by a, then c2 is added to all numbers. The mean of the new data set is 3 and the standard deviation is 2.6. Find the value of a.

Chose the graph below that represents the following system of inequality’s

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.

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip