Early humans used to hunt small and big animals using tools to obtain them as food. Also the hunting practice used to be tiring, time consuming, effort oriented and people used to hunt individually and also in groups. So, some plant species were identified which can give a good alternative against hunting and they were planted and cared upon. Also some domestic animals proved to be a good source of food and some of them used to help humans in locating food. The domestication of animals is associated with permanent settlement of humans.

6 0

3 years ago

Consider 3 urns. Urn A contains 2 white and 4 red balls, urn B contains 8 white and 4 red balls, and urn C contains 1 white and

elixir [45]

Answer:0.636

Explanation:

Given

Urn A contains 2 W, 4 R

Urn B contains 8 W, 4 R

Urn C contains 1 W, 3 R

Probability of selecting 3 balls out of which 2 are white

P(J)=P(WWR)+P(WRW)+P(RWW)

$P(J)=\frac{2}{6}\cdot \frac{8}{12}\cdot \frac{3}{4}+\frac{2}{6}\cdot \frac{4}{12}\cdot \frac{1}{4}+\frac{4}{6}\cdot \frac{8}{12}\cdot \frac{1}{4}=\frac{88}{288}$

Probability that the ball chosen from Urn A was white given that exactly 2 white balls were selected

i.e.

$P(A/J)=\frac{P\left ( A\cap J\right )}{P\left ( J\right )}$

$P(A/J)=\frac{\frac{56}{288}}{\frac{88}{288}}=0.636$

3 0

4 years ago