A normally distributed variable, x, has a mean of 259. p(x < 261.51)= 0.9184. Find the standard deviation of x.

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Jim had 15 minutes to do 5 laps around his school what would his time be

Find y to the nearest hundreds place