Multiple Choice
A grouped frequency distribution has a mean of 100 and a standard deviation of 20. The class limits for one class are 50 up to 60. What are the standard normal z-statistics for the class limits?
A) -20 and 20.
B) -2.5 and -2.0
C) 2.0 and 2.5
D) -50 and -40
Correct Answer:

Verified
Correct Answer:
Verified
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