1/4 hope this helps you!!!
Buying 2 apple for $0.19 is better
Answer:
Step-by-step explanation:
given that on a six-question multiple-choice test there are five possible answers for each question, of which one is correct and four are incorrect
By mere guessing probability for choosing correct answer = p = 0.2
also each question is independent of the other
Hence if X is the number of correct questions then
X is binomial with p = 0.2 and n = 6
a) being correct on three questions,
=![P(X=3) = 0.08192](https://tex.z-dn.net/?f=P%28X%3D3%29%20%3D%200.08192)
(b) being correct on four questions,
= ![P(X=4) = 0.01536](https://tex.z-dn.net/?f=P%28X%3D4%29%20%3D%200.01536)
(c) being correct on all six questions
=![P(x=6) = 0.000064](https://tex.z-dn.net/?f=P%28x%3D6%29%20%3D%200.000064)