SOLUTION: How do u solve this question? A study monitored the life spans of 129 robins over 4 years. The equation was developed to calculate the number of years y for x percent of the

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Question 78709: How do u solve this question?
A study monitored the life spans of 129 robins over 4 years. The equation was developed to calculate the number of years y for x percent of the robin population to die.

y= 2-log(100-x)/.42
How many robins had died after 6 months?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A study monitored the life spans of 129 robins over 4 years. The equation was developed to calculate the number of years y for x percent of the robin population to die.
y= 2-log(100-x)/.42
How many robins had died after 6 months?
Let y=(1/2) yr and solve for x:
0.5=2-log(100-x)/0.42
-1.5=-log(....)/0.42
log(100-x)=0.63
100-x=10^0.63
100-x=4.2657
x=95.73%
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# of robins that died is 0.9573*129=123+
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Cheers,
Stan H.