The variance of a discrete random variable X with pmf functionf(x) is definedas∑x((x−μX)2f(x)), which is the expected value of the squared distancefrom the mean ,μX. Show that this sum is equal to∑x(x2f(x))−μ2X.

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Ineed no it anyone can see this