Mathematics

12th

grade

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Normal Distribution

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20 questions

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  • 1. Multiple Choice
    30 seconds
    1 pt

    434 Company pack coffee in bags marked as 250 g

    A large number of packs of coffee were weighed and the mean and standard deviation were calculated as 255 g and 2.5 g respectively.

    Assuming this data is normally distributed, what percentage of packs are underweight?

    2.5%

    3.5%

    4%

    5%

  • 2. Multiple Choice
    30 seconds
    1 pt

    Students pass a test if they score 50% or more.


    The marks of a large number of students were sampled and the mean and standard deviation were calculated as 42% and 8% respectively.


    Assuming this data is normally distributed, what percentage of students pass the test? in percentage...

    5

    16

    24

    32

  • 3. Multiple Choice
    2 minutes
    1 pt
    Image

    The ages of the population of people living in Meru area in Ipoh are Normally distributed with mean 43 and standard deviation 14


    The town has a population of 5,000.

    How many would you expect to be aged between 22 and 57?


    You can use this Standard Normal Distribution curve:

    1750

    3860

    3870

    4330

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