Insert parentheses to make the equation true then simplify
1 answer:
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Since the radius is 6 inches, the area is
squared inches.
Now, the full circle is a sector given by a 360° angle. So, the area of a 140° angle will be proportionate:
Solving for , we have
Probability of an adult who needs correction = 82% or 0.82
So, probability of an adult who does not needs correction = 1 - 0.82 = 0.18
If 12 adults are randomly selected, the probability that at least 11 of them need correction for their eyesight is:
12C11 + 12C12
= 12*0.11*0.18 + 1*0.09*1
= 0.238+0.09
= 0.328 or 0.33
And, yes, 11 is significantly a high number of adults requiring eyesight correction.