Answer:
The probability is 0.9211
Step-by-step explanation:
Let's call K the event that the student know the answer, G the event that the student guess the answer and C the event that the answer is correct.
So, the probability P(K/C) that a student knows the answer to a question, given that she answered it correctly is:
P(K/C)=P(K∩C)/P(C)
Where P(C) = P(K∩C) + P(G∩C)
Then, the probability P(K∩C) that the student know the answer and it is correct is:
P(K∩C) = 0.7
On the other hand, the probability P(G∩C) that the student guess the answer and it is correct is:
P(G∩C) = 0.3*0.2 = 0.06
Because, 0.3 is the probability that the student guess the answer and 0.2 is the probability that the answer is correct given that the student guess the answer.
Therefore, The probability P(C) that the answer is correct is:
P(C) = 0.7 + 0.06 = 0.76
Finally, P(K/C) is:
P(K/C) = 0.7/0.76 = 0.9211
Answer:
6.8, 26.2, -7.8, -10.2, 2.6, -12.9
Step-by-step explanation:
20. is 6.78232 Rounded answer is 6.8
21. 26.172504657 rounded to the nearest tenth is 26.2
22. is -7.8102496759 rounded to the nearest tenth is -7.8
23. -10.246950766 rounded to the nearest tenth is -10.2
24. is 2.5980762114 rounded to the nearest tenth is 2.6
25. -12.942179106 rounded to nearest tenth is -12.9
Answer: 49
Step-by-step explanation: just roll with it
Step-by-step explanation:
2πrh+2πr²=surface area
2π(3)(6)+2π(3²)
36π+18π
54π
