960 48*20=960, 48*21=1008
Firstly, subtract a^2 on both sides:
Next, we are going to be using the difference of squares, which is . Use this on the right side of the equation:
Lastly, square root both sides of the equation, and <u>your answer will be </u>
Answer:
3.85 (rounded to 4 cars)
Step-by-step explanation:
Let X be the discrete random variable the number of vehicles changing lanes
X~B(7, 0.55)
The expected value is found by:
E(X) = 7 × 0.55
E(X) = 3.85