Question

Snakes shed their skin to enable growth. If the time it takes for a snake to shed its akin is normally distributed with mean of 8 days and standard deviation of 2 days, what is the probability that a snake will shed its skin after 7 days?

Answer 1

$$P(X>7)=1-P(X\leq7)$$

$$1-P(Z\leq\dfrac{7-8}{2})=1-P(Z\leq-0.5)$$

$$\approx0.691462$$

The probability that a snake will shed its skin after 7 days is 0.691462.