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ketch and label a graph of each bell shaped distribution

2. If z is the standard normal variable, find P( -1.3 < z < 1.3)

3. If X is a normal variable with mean = 100 and = 7, find P( X > 110)

4. The scores on a test are normally distributed with a mean of 72 and a standard deviation of 6. Find the probability that a student scored at least 80.

5. A sample of cereal boxes has a mean content of 234 grams with a standard deviation of 4.6 grams. Find the percentage of the boxes that could be expected to contain between 232.2 and 233.87 grams. Give your answer to the nearest whole number.