Tom earned $600 last summer delivering newspapers. This summer, he earned 20% more. How much did he earn this summer?
2 answers:
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Answer:
0.3745
Step-by-step explanation:
We have to solve the problem by calculating the z-score value that has the following formula:
z <(x - m) / sd
x is the value to evaluate (<80), m is the mean (85) and the standard deviation is sd (12)
replacing:
p (x <80) = z <(80 - 85) / 12
z <-0.416, we look for this value in the normal distribution table and it corresponds to:
p (x <80) = 0.3745
Which means that the proportion of people is 0.3745
