Consider randomly selecting a student who is among the 14,000 registered for the current semester in a college. let be the number of courses the selected student is taking, and suppose that has the following probability distribution: 1 2 3 4 5 6 7 0.02 0.01 0.20 0.17 0.39 0.20 0.01 find the expected number of courses a student is taking in this semester (write it up to second decimal place).

Step-by-step explanation:

Let be X the event : ''The number of courses the selected student is taking''

X is a discrete random variable.

X has the following probability function :

Let's check that f(x) is a probability function :

The sumatory of all it ranges must be equal to 1

Then f(x) defines a probability function.

The expected number of the random variable X is :

The sum of all its xi.f(xi) from i = 1 to n

can you me with homework?

step-by-step explanation:

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation: