During a 4 year period 45% of snowstorms in a certain city caused power outages. twenty two of the snowstorms did not cause power outages. find the total number of snowstorms in this city over the 4 year period.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.