Answer:
B. When the binomial distribution is approximately bell shaped, about 95% of the outcomes will be in the interval from mu minus 2 sigma to mu plus 2 sigma. The Empirical Rule can be used to identify results in binomial experiments when np left parenthesis 1 minus p right parenthesis greater than or equals 10.
Step-by-step explanation:
The empirical rule states that in a bell shaped distribution, 68% of the data falls within 1 standard deviation of the mean; 95% of the data falls within 2 standard deviations of the mean; and 99.7% of the data falls within 3 standard deviations of the mean.
The mean is represented using μ and the standard deviation is representing using σ. This means that 95% of the data will fall from μ-2σ to μ+2σ.
The sample size is represented using n. The probability of success is represented as p, and the probability of failure would then be 1-p. In order to use the empirical rule, np(1-p) must be greater than or equal to 10.