exam Maths Puzzle Numerical Ability

Find the mean, variance, and standard deviation of the binomial distribution with the given values of n and p. n=73 p=.7
Find the mean of the binomial distribution
mean=?

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exam Other Question
Remove the parentheses by applying the Distributive Property. 20x(3-2x) Two numbers have a sum of 22. Their difference is 4. what are the two numbers?

What is the correct way to figure this out? (Childs homework and needs help)

Thank you

John