answer all these questions please with the right question number next to its letter
QUESTION 18
What is the appropriate number of classes for a frequency distribution with 200 observations (n)?
A 
5 

B 
6 

C 
7 

D 
8 
QUESTION 19
For salaries of $152,000, $148,000, $25,000, $156,000 and $151,000, the arithmetic mean would be an appropriate measure of central tendency to use.
A)True
B) False
QUESTION 20
In a positively skewed distribution, the mode is greater than the median.
A) True
B) False
( 1 )
Answer : Option ( D )
From strugges rule
# of classes = 1 + 3.322 log (N )
= 1 + 3.322 log (200 )
= 8.6 ~ 8
( 2 )
Answer ; True
Because there are no outliers
( 3 )
Answer : False
Because in positively skewed distribution, the mode is smaller than the median.
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