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MArishka [77]
3 years ago
6

I need help ASAP only with four and 5 please help thank you so much asap

Mathematics
1 answer:
kramer3 years ago
8 0
Sedimentary rocks for the first one I think
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2 years ago
Mark tosses a coin 25 times. What is the probability that it lands on heads exactly seven times?
mezya [45]

Answer:

1.43%

Step-by-step explanation:

we have that we can solve it by means of binomial, in this case m = 25. Also the probability of head is 50%. we need to know when it falls 7 times, therefore x = 7

the formula is:

P (x) = mCx * p ^ x * q ^ (m-x)

we know that p is 0.5 therefore q is equal to 0.5, replacing:

P (7) = 25C7 * 0.5 ^ 7 * 0.5 ^ (25-7)

P (7) = 25! / (7! * (25-7)!) * 0.5 ^ 7 * 0.5 ^ (25-7)

P = 0.0143

that is, the probability is 1.43%

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2 years ago
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5 yellow marbles out of total of 17 marbles so 5/17
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2 years ago
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