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After 110 minutes, 50% will be left.
After 220 minutes, 25% will be left.

However, you want it after 200 minutes. Because 25% is left after 220 minutes, after just 200 there will be a bit more than 25% left.

The only answer that fits this is 28%. It can't be 25% or less than 25%, and we already worked out that 50% would be left after just 110 minutes.

So the answer is A, 28%.

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Home >All Categories > Science & Mathematics >Chemistry >Open Question Ni H Member since:February 03, 2007Total points:508 (Level 2)the question said it's 97% of the sample mean. the answer for z value is 2.17. I don't know how to look for z value in the table. Can someone explain it to me? Thanks.Answer Question

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Home >All Categories > Science & Mathematics >Biology >Open Question aryan Member since:March 01, 2010Total points:132 (Level 1)here is the full question "A lab technician, working in a dimly lit CSI lab, receives a small DNA sample from a crime scene. explain how the technician can make more of the DNA sample and compare that DNA from DNA samples from four suspected criminals. Be sure to use the following terms in you answer: gel electrophoresis, PCR, restriction enzymes, and band size and charge." From My biology 1406 test.....Answer Question

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A pencil and paper test was devised to assess self-reported amount of time spent in various physical activities. The intent of the test was to distinguish between fit and sedentary individuals. To investigate the validity of this instrument (whether or not it correctly identified individuals as being fit or sedentary) a researcher measured the max VO2 of 8 subjects classified by the written test as fit and another 8 subjects classified by the test as sedentary.

If the researcher believes the pencil and paper test to be valid, what would be her research hypothesis?

please explain....

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