On a radio morning show every 12th caller receives concert tickets and every 16th caller receives an autographed album. What caller number will receive both

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Me with this one question, and i'll upvote the brainliest answer

The perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.