Suppose that of 1400 students, 550 take Spanish, 700 take biology, and 400 take both
1 answer:
Answer:
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Explanation:
<u>1. Call A the event of selecting a student who takes Spanish and P(A) the corresponding probability:</u>
- P(A) = number of students who take Spanish / number of students
- P(A) = 550 / 1400 = 11/28
<u>2. Call B the event of selecting a student who takes biology and P(B) the corresponding probability:</u>
- P(B) = number of students who take biology / number of students
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<u>3. The joint probability, P(A∩B), is the probability that a student takes Spanish and biology:</u>
- P(A∩B) = number of students that take both Spanish and biology / number of students
<u>4. By the properties of probabilities, the probability of the event A or B is:</u>
- P (A or B) = P (A∪B) = P(A) + P(B) - P(A∩B)
- P(A or B) = 11/28 + 1/2 - 2/7 = (11 + 14 - 8) / 28 = 17/28
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Step-by-step explanation:
Answer:
0.89 g/cm³
Step-by-step explanation:
used the formula d=M/V
M is mass which is = 80g
V is volume which is = 90cm³
d = 80/90
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Answer:
-4/5
Step-by-step explanation:
first use bodmas to evaluate work on brackets then division