Resources for Teaching Mathematics

We should add together all the students who took longer than 90 min to finish the test. About 6 took between 90 ~105 and about 4 took between 105~120. The total should be around 10. ... A. Use your calculator. B Since it follows the standard normal distribution, the standard deviation(s) equals to one. S= variance = 1. A. Z= (42-50)/10=-0.8 ... ................
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