Janice conducted a survey at the local calculator factory. She discovered that 10% of every 80 calculators did not work. Using this survey, what kind of predictions can she make about the next 400 calculators?
a-not enough information
b-40 will not work
c-5 will not work
d-8 will not work
what is 10% of 80 ?
correct,
10% of 80 is 8
so prob of fail = 8/80 = 1/10
so for 400 units, prob = (1/10(400)
=
40
To answer this question, we need to calculate the number of calculators that would not work based on the survey conducted by Janice.
According to the survey, 10% of every 80 calculators were found to not work.
To find out the number of calculators that would not work in the next 400 calculators, we can use the same proportion.
First, we calculate the number of non-working calculators in each group of 80 calculators:
10% of 80 = 0.10 * 80 = 8 calculators
Then, we can calculate the number of non-working calculators in the next 400 calculators by multiplying the number of groups (400/80 = 5 in this case) by the number of non-working calculators in each group:
5 * 8 = 40 calculators
Therefore, Janice can predict that out of the next 400 calculators, there will be a total of 40 calculators that will not work.
The correct answer is b) 40 will not work.