harri26348
30.05.2020 •
Mathematics
Miguel has to take two quizzes tomorrow. He has only enough time to study
for one of them.
• The history quiz has 4 true-or-false questions.
• The science quiz has 3 multiple-choice questions.
Miguel calculates the probability that he will get all the questions correct by
guessing.
To get 100% correct:
P(guess is correct)
History
Answer 4 of 4 correctly.
0.5
Science
Answer 3 of 3 correctly.
0.2
Miguel will study for the quiz on which he is likely to do worse by guessing.
Which quiz should he study for?
O
A. History, because he must get more questions correct.
B. Science,
C.History,
Solved
Show answers
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Ответ:
Option B is correct.
Miguel should study for the Science quiz as he will do worse in that quiz by guessing.
Step-by-step explanation:
Miguel has to take two quizzes
1) 4 true or false questions on History with a 0.5 chance of acing the quiz
Expected number of correct questions = np
n = number of questions
p = probability of acing the test
Expected number of correct questions = 4 × 0.5 = 2
2) 3 multiple choice questions on Science with a 0.2 chance of acing the quiz.
Expected number of correct questions = 0.2 × 3 = 0.6
It is evident that guessing would yield a worse result in the Science quiz with less than 1 question expected to be correct than history, where he is still expected to get 2 questions correctly by guessing.
Hope this Helps!!!
Ответ:
32
Step-by-step explanation:
It is given that Jeff and his friend each text four classmates about an concert that is two people texts four classmates then 2×4=8 people are notified about the concert, then according to question, each 8 of them texts 4 more students from a different school about the concert, so the total number of people from the other school which are being notified about the concert will be 8×4=32.