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1) A normal probability distribution has a mean ??and a standard deviation ?? find the probability of randomly getting a score between 68 and 80?   2

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1) A normal probability distribution has a mean ??and a standard deviation ??

find the probability of randomly getting a score between 68 and 80?

 

2. A normal probability distribution has a mean ??and a standard deviation ??

find the probability of randomly getting a score less than 80?

 

3. A normal probability distribution has a mean ??and a standard deviation ??

find the probability of randomly getting a score between 56 and 80?

 

4. A normal probability distribution has a mean ??and a standard deviation ??

find the probability of randomly getting a score less than 56?

 

5. A normal probability distribution has a mean ??and a standard deviation ??

find the probability of randomly getting a score higher than 80?

 

6. Find : ??

 

7. Find : ??