The probability that exactly 6 are sedimentary is 0.00002
- Probability is the likelihood or chance that an event will occur.
- Given the total amount of rocks = 10 + 8 + 8 = 26 rocks
If there is a total of 8 sedimentary rocks, the total outcome will be expressed as:
26C8 = 26!/(26-8)!8!
26C8 = 1562275
If exactly 6 are sedimentary are selected out of 8 sedimentary rocks, then the expected outcome is ;
8C6 = 8!/(8-6)!6!
8C6 = 28
Pr(exactly 6 are sedimentary
) = 28/1562275
Pr(exactly 6 are sedimentary
) = 0.000017922
Hence the probability that exactly 6 are sedimentary is 0.00002
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