(1 point) Select the correct answer(s) from the choices below. Suppose 20 donors come to a blood drive. Assume that the blood donors are not related in any way, so that we can consider them to be independent. The probability that a donor has type "O' blood is 0.06. What is the probability that two donors have type O blood? A. 0.885 B. 0.225 C. 0.370 D. 0.290

Option B: 0.225

Step-by-step explanation:

We want that two donors among the 20 to have a type O blood, so first we need to make a combination of 20 choose 2, as these two donors can be any group of 2 people among the total of 20:

C(20,2) = 20!(18!*2!) = 20*19/2 = 190

Then, we need to multiply by the probabilities of each case:

probability of two people being type O: 0.06^2

probability of eighteen people not being type O: (1-0.06)^18 = 0.94^18

So, the final probability is:

P = 190 * 0.06^2 * 0.94^18 = 0.2246 = 0.225

The correct option is B

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step-by-step explanation:

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.