Histograms Flashcards
1
Q
How do you calculate frequency density?
A
Frequency / Class width
2
Q
How do you calculate frequency from a histogram?
A
Frequency density x class width
3
Q
In a normal distribution, what percentage of all values are within one standard deviation of the mean?
A
68%
4
Q
In a normal distribution, what percentage of all values are within two standard deviations of the mean?
A
95%
5
Q
In a normal distribution, what percentage of all values are within three standard deviation of the mean?
A
99.7%
