The half-life of chromium-51 is 28 days. If the sample contained 5.10 grams, how much chromium was present 168 days ago?
1 answer:
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Answer:
The right answer is:
(a) 0.205
(b) 0.005425
Step-by-step explanation:
The given data is:
0.213, 0.204, 0.208, 0.200, and 0.198
(a)
The mean will be:
=
=
=
=
or,
=
(b)
The standard deviation will be:
or,
The value of the y coordinate of any point on the x axis is always 0.
<u><em>Explanation</em></u>
Suppose, the co ordinate of any point is .
It means, the distance of the point from x-axis is '' and distance from y-axis is '
'.
Now if the point lies on the x-axis, that means the distance of the point from x-axis will be 0. Thus, the value of '' will be 0.
So, the value of the y coordinate of any point on the x axis is always 0.