SOLUTION: From numbers 3,5,5,7,7,7,9,9,9,9 one numbers is selected at random find the probability that the selected number is mean Please help me to solve this sum

Algebra ->  Probability-and-statistics -> SOLUTION: From numbers 3,5,5,7,7,7,9,9,9,9 one numbers is selected at random find the probability that the selected number is mean Please help me to solve this sum      Log On


   

Question 952028: From numbers 3,5,5,7,7,7,9,9,9,9 one numbers is selected at random find the probability that the selected number is mean

Please help me to solve this sum
Answer by macston(5194) About Me  (Show Source):
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The sum of the 10 numbers is 70 so the mean is 70/10=7
Since three of the ten numbers are sevens, the chance a 7 will be chosen is 3 in 10 or 3/10(100%)=30%