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GaryK [48]
3 years ago
14

do more kids say they want to see into the future or become invisible? invisible is 9/50 future is 1/5 what is more?

Mathematics
1 answer:
Olin [163]3 years ago
4 0
So this question is asking whether 9/50 or 1/5 is more. To do this we need to make 1/5 have a denominator of 50. So, we multiply the numerator and the denominator by 10.

1/5 * 10/10 = 10/50

Because 9/50 is less than 10/50, more kids want to see in the future.
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Answer:

Option C: 11.7%

Step-by-step explanation:

The number of elements in sample space when a coin is flipped 10 times will be:

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Let A be the event that the tails appear 7 times:

Then,

C_{(n,k)}=\frac{n!}{(k!)(n-k)!} \\where\\n=population\\k=picks\\In our case, k =7\\and\\n=10\\C_{(10,7)}= \frac{10!}{(7!)(10-3)!}\\= 120\\So, \\P(A) = \frac{n(A)}{n(S)} \\P(A) = \frac{120}{1024} \\= 0.1171\\

Converting into percentage:

P(A) = 0.1171*100=11.7%

So, option C is correct ..

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