. Suppose that vehicle speed on a bridge can be modeled as normally distributed. a. If 5% of all vehicles travel less than 39.12 km/h and 10% travel more than 73.24 km/h, what are the mean and standard deviation of vehicle speed? b. What is the probability that a randomly selected vehicle’s speed is between 50 km/h and 65 km/h? c. What is the probability that a randomly selected vehicle’s speed exceeds the speed limit of 70 km/h?

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.

answer is 8 r5

step-by-step explanation: