The length of a text messaging conversation is normally distributed with a mean of 10 minutes and a standard deviation of 4 minutes. what is the probability that a conversation lasts longer than 20 minutes?

The standard of deviation is 4.

The mean is 10

20 minutes - 10 ( the mean) = 10 minutes longer than the mean.

10 minutes longer / 4 minutes ( deviation) = 2.5 standard deviations.

2.5 on the Z-table = 0.9938

The probability of being more than 20 minutes = 1 - 0.9938 = 0.0062 (0.62%)

if you explain the the question more correctly i might be able to answer this better

step-by-step explanation:

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i