In a batch of 1160 calculators, 5 were found to be defective. What is the probability that a calculator chosen at random will be defective? Write the probability as a percent. Round to the nearest tenth of a percent if necessary.
Probability = favorable cases / total cases.
favorable cases = 5 defective
total cases = 1160 calculators
P = 5/1160 = 0.004310,
to find a probability as percent you need to multiply *100%
so P = 0.004310 * 100 = 0.431 = 0.4% to the nearest tenth percent
so the answer will be B. 0.4%
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