The first standard deviation covers about 68% of the distribution in a normal curve. (34% higher, 34% lower than the mean). the second standard deviation covers 28% (14% between 1st and 2nd SD above the mean, 14% between 1st and 2nd SD below the mean). In our case
1 Standard deviation = 27 hours (we will approximate to 25 hours)
Mean = 2,000
This means that 34% of the distribution is between 1975 and 2000 hours (within 1 standard deviation below the mean)
2,000- 2,050 covers the range within 50 hours above the mean.
50 hours is roughly 2 standard deviations. The second standard deviation (standard deviation between 1 and 2) covers around 14% on each side of the distribution.
50 hours is roughly 2 standard deviations, which means we add 34% + 14% = 48%.
The range of 1,975 - 2,050 hours covers 34% of the distribution below the mean and 48% of the distribution above the mean.
This means that the probability that the light bulb will last somewhere within this range is 34% + 48% = 82%
The closest answer is 79%. The difference can be explained by the fact that, for simplicity, we approximated the standard deviation to be ~25 hours instead of the real standard deviation of 27 hours.
D. Since we know that 1 ticket = $8 we would multiply to figure out how much 7 tickets were. (7x$8). And to figure out his change you would subtract the ticket amount from $100 :) Hope this helps
Answer:
<h2>The point is 4 units away from the x-axis.</h2>
Step-by-step explanation:
The given ordered pair is (4, 5).
Remember, in a ordered pair, the first number is about the number of units used horizontally, and the second number is about the number of units used vertically.
So, this point is 4 units right side of the origin and 5 units upside of the origin.
Therefore, the point is 4 units away from the x-axis.
400×5%=20+400=420
four-hundred times five percent equals twenty add four-hundred and you get four hundred twenty
30pages/hour| 1 day
| 24hours
So...
30\24= 1.25 pages/day
