How does the author’s reference to Rosa Parks in paragraph 2 contribute to the overall text?

A
It shows how important the contributions of black women were to the Civil Rights Movement.
B
It provides an example of a black woman who was adequately recognized for her contributions.
C
It shows how black women were silenced and prevented from providing further aid to the movement because of their gender.
D
It gives an example of how women worked in the background of the Civil Rights Movement.

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Ответ:

bussbhsvssu557

16.06.2020

English

The probabilities are:

For no successful surgeries: practically 0For one successful surgery: 0.004For two successful surgeries: 0.021For three successful surgeries: 0.074For four successful surgeries: 0.167For five successful surgeries: 0.251For six successful surgeries: 0.251For seven successful surgeries: 0.161For eight successful surgeries: 0.06For nine successful surgeries: 0.01

Step-by-step explanation:

Lets call X the total number of success. X counts the number of success from the same experiment repeated 9 times with a probability of success of 0.6 and one experiment independent of the other. Therefore X has Binomial distribution, X ≈ Bi(9,0.6).

The range of X is {0,1,2,3,4,5,6,7,8,9} and the probability of X being equal to a value k in its range is the number P_X(k) given by

$P_X(k) = {9 \choose k} \, 0.6^k * (1-0.6)^{9-k}$

Thus,

$P_X(0) = {9 \choose 0} (0.4)^9 = (0.4)^9 = 0.000262 ,$ rounded to 0 $P_X(1) = {9 \choose 1} 0.6 * 0.4^8 = 9 * 0.6 * 0.4^8 = 0.004$ $P_X(2) = {9 \choose 2} 0.6^2 * 0.4^7 = 36 * 0.6^2*0.4^7 = 0.021$ $P_X(3) = {9 \choose 3} 0.6^3 * 0.4^6 = 84 * 0.6^3*0.4^7 = 0.074$ $P_X(4) = {9 \choose 4} 0.6^4 * 0.4^5 = 126*0.6^4*0.4^5 = 0.167$ $P_X(5) = {9 \choose 5} 0.6^5 * 0.4^4 = 126*0.6^5*0.4^4 = 0.251$ $P_X(6) = {9 \choose 6} 0.6^6 * 0.4^3 = 84*0.6^6*0.4^3 = 0.251$ $P_X(7) = {9 \choose 7} 0.6^7 * 0.4^2 = 36*0.6^7*0.4^2 = 0.161$ $P_X(8) = {9 \choose 8} 0.6^8*0.4 = 9*0.6^8*0.4 = 0.06$ $P_X(9) = {9 \choose 9} 0.6^9 = 0.6^9 = 0.01$

I hope that works for you!

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