Why is it important to check the 10% condition before calculating probabilities involving x–?

(a) To reduce the variability of the sampling distribution of x–.

(b) To ensure that the distribution of x– is approximately Normal.

(c) To ensure that we can generalize the results to a larger population.

(d) To ensure that x– will be an unbiased estimator of m.

(e) To ensure that the observations in the sample are close to independent.