125 because f=ma so you would use 100=mx0.75
The probability that the mean race time is less than 4. 3 minutes is 0.3534.
<h3>
Normal distribution curve</h3>
A normal distribution curve can be used to determine the probability of selecting a mean race time less than 4.3 minutes.
<h3>In normal distribution curve</h3>
- Mean = median = 50%
- 1 standard deviation below the mean (M - d) = 16%
<h3>Time of race at 1 standard deviation below the mean</h3>
5.18 - 1(2.34) = 2.84 minutes
4.3 minutes is greater than 2.84 minutes but less than 5.18 minutes.
Apply interpolation method to determine the probability corresponding to 4.3 minutes.
5.18 ---------------- 50%
4.3 ------------------- ?
2.84 ----------------- 16%
x = 0.37
The area of normal distribution curve is not equal at all points, it is more towards the center and less towards the left. The probability will shift little to left, with a value of 36% or 35%.
Thus, the probability that the mean race time is less than 4. 3 minutes is 0.3534.
Learn more about normal distribution curve here: brainly.com/question/14644201
When a tennis ball smashes into a tennis racket, the ball temporarily changes shape as it compresses against the racket
The amount of coal burnt to operate the mini fridge is 0.81 metric tons.
<h3>What is energy cost?</h3>
The term energy cost refers to the monetary cost of operating a particular electrical appliance. Let us now answer the questions one after the other.
a) Power consumption per hour = 100 watt or 0.1kW. To operate it for an hour we have 0.1kWhr × $0.10/kWh = 0.01$ Since it operates for twelve hours a day 12(0.01$)= 0.12$ per day. In five years; 0.12$× 5 × 365 = 219 $.
b) Electricity used for the five years = 5 × 365 × 12 × 0.1kWhr = 2190 kWhr
Since 1 metric ton of coal produces 2713 kWh(considering energy losses)
x metric tons of coal produces 2190 kWhr
x = 1 metric ton × 2190 kWhr/2713 kWh
x = 0.81 metric tons
c) In part 1 we did not include the cost of the environmental damage caused by the mining of coal and the social inconveniences caused by the sound of the mini fridge.
d) The college student could reduce the electricity use associated with having a mini fridge in his or her dorm room by turning it off for some hours within the day.
Learn more about cost of electricity: brainly.com/question/13498414
Same magnitude (1000N) and opposite direction
you may also answer -1000 N