Answer:
5 hours
Step-by-step explanation:
63t=315
t = 315/63
t=5
Answer:
7.6
Step-by-step explanation:
Answer:
(a)0.51
Step-by-step explanation:
Total number of Selected Students =100
Number who play organized Sports=51
We are to determine the Probability that a student selected at random plays organised sports.
Probability=Number of Required Outcome ÷ Total Number of Outcome.
(a) P(a student plays organised sports)=51÷100=0.51
(b)A probability of 0.51 means that there is a 51% chance that a student selected at random plays organised sports. The chances a just a little higher than the probability that a student does not play organized sports.
The percentage of the radioactive isotope left is 25.0000%.
<h3>What is the half life?</h3>
The half life of a radioactive isotope is the time that will elapse before only half of the number of original isotopes will remain.
Now;
We are told that;
Half life (t1/2) = 55 days
Time taken (t) = 115 days
Ratio of isotope remaining = N/No
Thus;
N/No = (1/2)^t/t1/2
N/No = (1/2)^115/55
N/No = (1/2)^2
N/No =1/4
Hence, the percentage = 1/4 * 100/1 = 25.0000%
Learn more about half life of an isotope:brainly.com/question/16387602
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