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#1: Suppose the grades of students on a test are normally distributed with mean 75 and variance 25. Find the following probabilities: 1- Probability of

image text in transcribed #1: Suppose the grades of students on a test are normally distributed with mean 75 and variance 25. Find the following probabilities: 1- Probability of grades less than 65. 2- Probability of grades between 70 and 85. 3- Probability of grades more than 67. 4- Find the grade C, such that 20 percent of the grades exceed it 5- Find P90 6- Find 25image text in transcribed

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