What is the mean of 2,7,21,15,15,7,2?

Every time you drive you will experience a combination of driving conditions and environments.

Need on this geometry question. explain how you did it.

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest