Mathematics, 23.10.2019 11:00 marlag10

Acompany is testing a new device to detect certain substances inside suitcases. currently, the device is accurate 68% of the time for suitcases that have these substances. in a test where half of the 70 test suitcases carry these substances, about how many times will the test identify a suitcase with the substance as not having it?

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