Answer:
![P( X <2.5) = F(2.5) = (2.5-1)/(5-1) = (1.5)/(4)=0.375](https://img.qammunity.org/2021/formulas/mathematics/college/7fs0ip2dmx3o9kwj8thh10dfnraqsplp09.png)
Explanation:
For this case we define the random variable X as "amount of cheese on a slice of pizza" and the distribution for X is given by:
![X \sim Unif (a=1, b=5)](https://img.qammunity.org/2021/formulas/mathematics/college/iqj98o72uywf7bpzaqr7k6qt8uy7iz8ozv.png)
We want to find this probability:
![P(X <2.5)](https://img.qammunity.org/2021/formulas/mathematics/college/xk1bpqcas55ry2yjugx5gx3osvpddh76n7.png)
And we can use the cumulative distribution function given by:
![F(x) = (x-a)/(b-a) , a \leq X \leq b](https://img.qammunity.org/2021/formulas/mathematics/college/qb0cb8p5h23q5wifrxpkfghvbx4fwewu5e.png)
And for this case we can use this concept and we got:
![P( X <2.5) = F(2.5) = (2.5-1)/(5-1) = (1.5)/(4)=0.375](https://img.qammunity.org/2021/formulas/mathematics/college/7fs0ip2dmx3o9kwj8thh10dfnraqsplp09.png)