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jeyben [28]
3 years ago
11

If the mean of a symmetric distribution is 110, which of these values is most likely to be the median of the distribution?

Mathematics
2 answers:
tensa zangetsu [6.8K]3 years ago
4 0
In a symmetric distribution, the mean is the same as the median.
kondor19780726 [428]3 years ago
3 0
<h2>Answer: in a symmetric distribution math problem , the mean is always the same as the median , hence the answer is <u>110 </u></h2>

Step-by-step explanation: APEX 10/23/19

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11 and 13 ONLY
gulaghasi [49]

11. The sum S of the first n consecutive positive integers, 1, 2, 3, ... , n, is given by the formula S=0.5n(n+1). Find n when S=120 and check your answer by addition.

120 = \frac 1 2 n (n+1)

240 = n^2 + n

n^2 + n -240 = 0

We need two numbers whose sum is 1 and multiply to -240, so two numbers whose difference is 1 and multiply to 240, 15 and 16. We factor:

(n+16)(n-15)= 0

n=-16 \textrm{ or } n=15

We reject the negative root.

n=15

Check:

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15

=1+15 + 2+14 + 3+13 + 4+12 + 5+11 +6+10 + 7+9 + 8

= 7(16)+8

= 120 good

13. A boat travels downstream (with the current) for 36 miles and then makes the return trip upstream (against the current). The trip downstream took 3/4 of an hour less than the upstream trip. If the rate of the current is 4 mph, find the rate of the boat in still water and the time for each part of the trip.

Let v be the speed of the boat in still water.

The speed downstream is v+4 so the time to travel 36 miles downstream is 36/(v+4)

The speed upstream is v-4 so the time to travel 36 miles upstream is 36/(v-4)

Writing our equation,

3/4 = 36/(v-4) - 36/(v+4)

3 = 144 (1/(v-4) - 1/(v+4))

3(v-4)(v+4) = 144( (v+4) - (v-4) )

v^2 - 16 = 48(8)

v^2 = 48(8) + 16 = 400

v = 20 mph, the rate of the boat in still water

Time downstream is 36/(20+4)=36/24 = 3/2 = 1.5 hours

Time upstream is 36/(20-4)=36/16=9/4 = 2.25 hours

3/4 hour difference, good

5 0
3 years ago
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