The probability of choosing a 6 at random from a standard deck of playing cards is 1/13 what is the complement of the event of choosing a 6

The ages of personnel in the accounting department of a large company are normally distributed with a standard deviation of 7 years. there is a 0.02275 probability that the age of any randomly chosen person in the department is less than 22 and 0.15866 probabilty that the age of any randomly chosen person is greater than 43. what is the mean of this distribution?

Round each decimal to the nearest hundredth

Write an expression to represent the perimeter 2a-3 , 3a+1 , 2a