Question

An urn contains 10 black balls and 5 white balls. If \[E\] is the event “first ball is black,” what is \[P(E)\]?

Options

• \[\frac{9}{14}\]

• \[\frac{5}{15}\]

• \[\frac{10}{15}\]

• \[\frac{3}{7}\]

Answer 1

There are 10 black balls among 15 total balls. Therefore, the probability that the first ball is black is \[P(E)=\frac{10}{15}\].