Question

The heights of students in the class can be summarized as follows:

Class : 159,169,179,189

Bin : 59,169,179,189

Frequency : 5,8,18,10,1

n : 42

Mean : 173.50

Variance : 112.92

St. Dev. 10.63

Assuming that this approximates a standard normal distribution, use the Z table to estimate:
a)	The number of students over 180 cm (Calculate probability first).
b)	The number of students between 175 and 185 cm.
c)	The number of students less than 175 cm.
d)	The number of students between 160 and 180 cm.
e)	Count the actual number in the above ranges and compare the results.

Answer 1