The scores of eight grade students in a math test are normally distributed with a mean of 57.5 and a standard deviation of 6.5. from this data, we can conclude that 68% of the students recieved scores between a)34 and 64 b)34 and 68 c)51 and 64 d)51 and 68

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.

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Solve the triangle. a = 21°, c = 105°, c = 5