Probability

Probability

This lesson answers the question: What are the differences between mean, median and mode in statistics? Also, we will learn how to calculate the probabilities out of a two-way frequency table, and figure out the trends.

Lessons

  • 1.
    a)
    Introduction to probability

    b)
    Introduction to statistics:
    • What is mean?
    • What is median?
    • What is an outlier?
    • What is mode?
    • What is range?


  • 2.
    The following is the money raised in a school fund raising activity by each class in grade 9: $1 000, $580, $810, $1 050, $840 and $600. What is the mean, median and mode amount of money raised by these six classes?

  • 3.
    Six hundred people were randomly selected in downtown. They were asked if they choose their clothes based on its comfort or style. The following is the results:

    Comfort

    Style

    Total

    Male

    172

    133

    305

    Female

    115

    180

    295

    Both

    287

    313

    600

    a)
    What is the probability that a person in the survey is a female?

    b)
    What is the probability that a person chooses comfort over style?

    c)
    What is the probability that a male chooses style over comfort?

    d)
    Was there any assumption made in this survey?