Definition
According the range rule of thumb, most values should lie within 2 standard deviations of the mean.
Given:
The probability that a pea has a green pod = 0.75
Number of groups = 22
The formula to find the value seperating the results that are significantly low is:
The mean and standard deviation can be found using the formula:
Where n is the numble of samples
p is the probability of success
q is the probability of failure
Substituting we have:
Using the range rule, the value seperating results that are significantly low is:
Answer: 12.438