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
That’s all correct thanks
Answer:
The Taj Mahal
The Taj Mahal was built in 1648 by Shah Jehan as a memorial to his wife. Today, it is listed as one of the new Seven Wonders of the World. Mughal Emperor Shah Jahan, lost his wife Mumtaz Mahal on June 17,
The perimeter of a triangle can be found by adding up all the sides
so the perimeter is :
5 + 8 + x =
13 + x <==
The answer your looking for is 46