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anonymous

  • one year ago

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  1. jtvatsim
    • one year ago
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    Sorry, I'm trying to find a good graph, I was busy editing the picture to work with this problem. :)

  2. jtvatsim
    • one year ago
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    Alright, this will require some explanation, but you can see the graph attached. This shows the diagram of a normal distribution. We will use this to solve the problem.

  3. jtvatsim
    • one year ago
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    The white percentages show the number of people between standard deviations. For example, 34.1% of people are between 0 and 1 standard deviation (the weird \[\sigma\] symbol stands for standard deviation)

  4. jtvatsim
    • one year ago
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    The red percentages are the ones that we care about in this problem. They show the total percentages. So, for example, at +1 standard deviation 84% of people are to the left of that point.

  5. jtvatsim
    • one year ago
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    From the question, we are told the following: mean = 12.89 standard deviation = 1.95 Marcus's score = 13.7 People who get certificates score better than 98% of people.

  6. jtvatsim
    • one year ago
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    The reason this problem seems hard is because we can't tell if 13.7 is better than 98% of people. If we knew that 13.7 was better than 98%, then Marcus should get a certificate. However, if 13.7 is worse than 98%, then Marcus should not get a certificate. We need a way to turn the 98% into a score for us to compare.

  7. jtvatsim
    • one year ago
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    Let me stop for a moment and give you a chance to ask any questions you have. You are probably still a little confused on the diagram I posted, but I'll explain how that comes in, in just a moment. The biggest thing is are you ok with the fact that we need to figure out what 98% actually means?

  8. anonymous
    • one year ago
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    yes, i probably could

  9. sohailiftikhar
    • one year ago
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    waite i'm looking the work of jv

  10. anonymous
    • one year ago
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    yes, i probably could

  11. sohailiftikhar
    • one year ago
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    so here we are given the situation that certificate will only give to the top 2% of those people who gave test .

  12. sohailiftikhar
    • one year ago
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    so if marcus didnt receive a certificate that's means he is not in that top 2% people even he score well ..understand ?

  13. sohailiftikhar
    • one year ago
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    we have to give a certificate only 2% people so we will take the top 2% means with higher score

  14. sohailiftikhar
    • one year ago
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    no he didn't receive the certificate because he was not in the toppers list

  15. sohailiftikhar
    • one year ago
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    this is given in statement . take a look that what they asked

  16. sohailiftikhar
    • one year ago
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    yes

  17. sohailiftikhar
    • one year ago
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    that's what i'm saying that he can't get enough score to get in 2% of ppl whos score is higher means toppers

  18. sohailiftikhar
    • one year ago
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    ok here is a example there are 20 seats in the company and they said that only 20 ppl can get job but for the minimum job score is 33 out of 100

  19. sohailiftikhar
    • one year ago
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    so one candidate scored 50 but he didn't get job ..why ?

  20. sohailiftikhar
    • one year ago
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    yes

  21. sohailiftikhar
    • one year ago
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    this what happened here ..they said they only give 2% of certificates and when they got filled marcus didn't get certificate because didn't get high score to be in that 2% of ppls

  22. sohailiftikhar
    • one year ago
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    consider these 2% are those whos score is 20,21and so on so this is higher than marcus .. get it now ?

  23. sohailiftikhar
    • one year ago
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    yes he didn't get the high score to beat the others

  24. sohailiftikhar
    • one year ago
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    so ? i'm going now

  25. sohailiftikhar
    • one year ago
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    it's simple you can say that there 2% of ppl who scored higher than marcus and we only have to give certificate of 2% ppl so he can't get certificate..

  26. sohailiftikhar
    • one year ago
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    i mean i'm going to offline now

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