Answer:
1
Step-by-step explanation:
The probability that a random variable has a particular value or a range of values is the sum of the probabilities associated with each of the values.
<h3>Application</h3>
All of the x-values in the table are less than or equal to 20, so p(x≤20) is the sum of all of the probabilities in the table.
p(x≤20) = 0.20 +0.15 +0.05 +0.1 +0.25 +0.1 +0.15 = 1.00
The probability is 1 that x ≤ 20.
It’s D i just took the test
To simplify the problem imagine the half-life was 2.5 minutes. This means that there would be 10/2.5=4 periods of halving the mass, which means 1/2⁴=1/16 of 18g=1.125g.
So for the given half-life we calculate 10/2.552=3.9185 approx. So we now find 2 to this power=15.1211 approx and divide into 18=1.19g. This is close to the rough estimate we did earlier.
