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Sonja [21]
3 years ago
6

When taking a 11 question multiple choice test, where each question has 4 possible answers, it would be unusual to get 3 Incorre

ct or more questions correct by guessing alone. Note: Of course it would be unusual to get 11 questions correct. You need to enter the smallest possible number of questions to make getting "that many correct" unusual.
Mathematics
1 answer:
marin [14]3 years ago
4 0

Answer:

6

Step-by-step explanation:

probability of answering a question correct p=1/4

let minimum number number of question that would be unusual =n

hence from binomial distribution P(X>=n) <0.05

\sum_{x=n}^{11}\binom{11}{x}(1/4)^{x}(3/4)^{11-x}

by solving:

n=6

it would be unusual to get 6 or more questions correct by guessing alone.

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And these questions
gtnhenbr [62]

Answer:

17) 250 km²

18) never

19) sometimes

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Step-by-step explanation:

17)

this polygon can be seen as the combination of two shapes : a 16×13 rectangle on top, and a right-angled triangle at the bottom.

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18) the first quadrant is the area between the right (positive) side of the x axis and the upper (positive) part of the y axis. all points here have always and only positive x and y values. never any negative ones.

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