1000 students take a survey
the survey reveals 20% of the students speak spanish. how many students speak spanish

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).

Hi, can anyone show me how to do this problem? 100 points for this. in advance

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that