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anonymous

  • one year ago

According to the distribution, if 1,000 students who took the test are randomly selected, how many scored a 2 or higher? A. 88 B. 120 C. 340 D. 880

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @Astrophysics

  3. ganeshie8
    • one year ago
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    Notice that these circled numbers below represent the height of bars, which represents the probability of achieving a particular test score. |dw:1439181806830:dw|

  4. ganeshie8
    • one year ago
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    Looking at that diagram, can you tell the probability of achieving a test score of 2 ?

  5. anonymous
    • one year ago
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    34%?

  6. ganeshie8
    • one year ago
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    Yes! whats the probability of achieving a test score of 3 ?

  7. anonymous
    • one year ago
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    31%

  8. ganeshie8
    • one year ago
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    good, so whats the probability of achieving a test score of 2 or higher ?

  9. anonymous
    • one year ago
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    88% ?

  10. ganeshie8
    • one year ago
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    Excellent! lets get back to the main problem

  11. ganeshie8
    • one year ago
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    you have 1000 students and you know that 88% of them are most likely to score 2 or higher

  12. ganeshie8
    • one year ago
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    so you simply need to find 88% of 1000 to get the number of students that score 2 or higher

  13. ganeshie8
    • one year ago
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    whats 88% of 1000 ?

  14. anonymous
    • one year ago
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    do i divide them?

  15. ganeshie8
    • one year ago
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    88% means 88 in every 100

  16. ganeshie8
    • one year ago
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    so how many in 1000 ?

  17. ganeshie8
    • one year ago
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    make a good guess, im sure u wil be right

  18. anonymous
    • one year ago
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    i got 0.088?

  19. ganeshie8
    • one year ago
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    0.088 students? haha are you planning to cut the students ? maybe forget the formulas. out of 100 students, if 88 students are good, then how many students will be good out of 1000 students ?

  20. ganeshie8
    • one year ago
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    100 ---> 88 1000 --> ?

  21. anonymous
    • one year ago
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    is it 880 by any chance?

  22. ganeshie8
    • one year ago
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    Yes, aren't you sure ?

  23. anonymous
    • one year ago
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    I added 88, 10 times... 😅

  24. ganeshie8
    • one year ago
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    interesting, why ?

  25. anonymous
    • one year ago
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    I could've multiplied it, but I didn't think of it, and bc if 100 = 88 and 100, 10 times is 1000 so I added 88 10 times..

  26. ganeshie8
    • one year ago
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    Awesome! thats good thinking!

  27. ganeshie8
    • one year ago
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    btw, 880 is correct

  28. ganeshie8
    • one year ago
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    880 is 88% of 1000

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