Question: please i need help in understanding this problem thank you so much A psychologist runs rats through a maze and records the total time it

please i need help in understanding this problem thank you so much

A psychologist runs rats through a maze and records the total time it takes for them to navigate the course. If the mean run lime is 21 minutes and the variance of the run times is 9, at least 68% of the rats will run the maze within what interval of time ? + Drag and drop yourles or click to browse

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