18 students in a sixth grade have brown hair. these students represent 3/4 of the class. how many students are in the class?

Which statements regarding the diagram are true? check all that apply.

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

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.