A study compares the use of unpaid family labor to hired labor on farms in the United States 100 farms were surveyed and 45 of the farms reported using family labor and 55 of the farms reported using hired labor. In addition, 30 of the 100 farms reported using both farm and hired labor in some combination. Use this information to calculate the probability that a farm uses only family labor or only hired labor. Report your answer either as a percentage or as a decimal value to the nearest hundredth.

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Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells.

Part (a) is relatively straight forward.there are 4 aces in a standard 52-card deck. so the probability that an ace is picked is just 4/52.part (b): note that there are 4 suits in a standard 52-card deck. so picking hearts will be 13/52 or 1/4.part (c): the probability condition or means we need to add the two probabilities because we do not want them simultaneously. so, we end up getting pr(ace) + pr(heart).from part (a), we found that picking an ace had a probability of 4/52, which is reduced down to 1/13.from part (b), we found that picking a heart had a probability of 1/4.so, the probability of an ace or a heart is 1/13 + 1/4 = 4/52 + 13/52 = 17/52.