Using the rule of 72, quickly estimate how many years it would take to reach $100,000 if you invest $50,000 today and make 6% annually.

17.62% probability that his height will be less than 66.7 inches

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean and standard deviation , the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

What is the probability that his height will be less than 66.7 inches?

This is the pvalue of Z when X = 66.7. So

has a pvalue of 0.1762

17.62% probability that his height will be less than 66.7 inches