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0.5

Step-by-step explanation:

How to Find the Mean. The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

When we add them, it's 2.5.

Now we divide.

0.5

Step-by-step explanation:

2+(-2.5)+(-1)+0+4 =2.5

2.5/5 = 0.5

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50