1. 7 : 07
2. 9 : 45
3. 6
4. 2 : 25
5. 8
6. 17
Solution: We are given:

Using the empirical rule, we have:
covers 68% of data.
Also the percentage of values below mean = Percentage of values above mean = 50%
Now, let's find the z score for x=20

Therefore, the percentage of values greater than 1 standard deviation above mean 
Expected number of students = 16% of 100 = 16
Answer:
what do you mean
Step-by-step explanation:
what do you mean