Answer the following. The scale on a map is 1:100000. Therefore 1cm on the map would equal how many kilometres on the ground? ​

At a lunchron, guests are offered a selection of five different grilled vegetables and four different meats. in how many waya could one choose three vegetables and two meats?

Answer question above and explain each step : )

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9