How many seconds are in an hour? is this a statistical question or non-statistical question.
1 answer:
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Answer:
Step-by-step explanation:
No. of red jelly = 10
No. of green jelly = 6
No. of yellow jelly = 7
No. of orange jelly = 5
Total number of jelly = 10 + 6 + 7 + 5 = 28
Hence, the required probability is 0.02 or 2 %
Answer:
A) 277 million years
Step-by-step explanation:
Here, decay of U-238 is first order reaction. (since most of the nuclear decays are first order).
so, the equation t = × ln(
)
where, t = time from start of reaction
k = reaction constant
A(0) = initial concentration; A = present concentration.
⇒ 4.5 billion = 4500 million years = × ln2.
Now, given 95.82% of parent U-238 isotope is left.
⇒ t = × ln(
)
t = × ln(
)
⇒ t ≅ 277 million years.