Question

Use the following results from a test for marijuana​ use, which is provided by a certain...

Use the following results from a test for marijuana​ use, which is provided by a certain drug testing company. Among

149 subjects with positive test​ results, there are 21 false positive​ results; among 155

negative​ results, there are 5 false negative results. If one of the test subjects is randomly​ selected, find the probability that the subject tested negative or did not use marijuana.​ (Hint: Construct a​ table.)

The probability that a randomly selected subject tested negative or did not use marijuana is?

Among 9177 cases of heart pacemaker​ malfunctions,523 were found to be caused by​ firmware, which is software programmed into the device. If the firmware is tested in 3 different pacemakers randomly selected from this batch of 9177 and the entire batch is accepted if there are no​ failures, what is the probability that the firmware in the entire batch will be​ accepted? Is this procedure likely to result in the entire batch being​ accepted?

The probability is?

This procedure is (likely,unlikely,certain)? to result in entire batch being accepted?

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