Find the mean and the median of this data set: 9,6,5,3,28,6,4,7

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

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?

What could explain what happened when the time was equal to 120 minutes