A camera flash, which throws a parallel beam of light, has a mirror behind the light bulb. What kind of mirror is it likely to b
1 answer:
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Answer:
(a) 99.865%
(b) 0.135%
Explanation:
Given that the weight of the boxes are normally distributed.
The average weight of the particular box,
ounce
The standard deviation of weight,
ounce.
Let be the standard normal variable,
And, the probability of the boxes having weight x ounces is
For ,
(a) For the boxes having weight more than 24.5 ounces:
So, the probability of boxes for is
=0.99865
So, the percent of the boxes weigh more than 24.5 ounces is 99.865%.
(b) For the boxes having weight less than 24.5 ounces: z<-3
So, the probability of boxes for z<-3 is
=0.00135
So, the percent of the boxes weigh more than 24.5 ounces is 0.135%.