Data:
basket 45% of the time
The 45% means that from each 100 times she throws the ball, 45 times she made a basket.
Then, if she throws the ball 40 times, she will made:
tb: throw ball
mb: made a basket
[tex]40tb\cdot\frac{45mb}{100tb}=18mb[/tex]She will make 18 baskets if she throw the ball 40times