Question

Cora is playing a game that involves flipping three coins at once let the random variable H be the number of coins that land showing heads. Here is the probability distribution for H.

Answer 1

0.5

Explanation:

That's the right answer on Khan

Answer 2

`P(H <3) = 0.875`

Explanation:

Given (Missing from the question):

`\begin{array}{cc}{H}&{P(H)&0&0.125&1&0.375&2&0.375&3&0.125\end{array}`

And the required question is:

Determine the P(H < 3)

P(H <3) implies that: P(H = 0) or P(H = 1) or P(H = 2)

So, we have:

`P(H <3) = P(H = 0) + P(H = 1) + P(H = 2)`

`P(H <3) = 0.125 + 0.375 +0.375`

`P(H <3) = 0.875`