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26 September, 15:25

The results for a survey of 120 students who were selected randomly are listed below.

60 students have a cell phone plan with company X

• 36 students have a cell phone plan with company Y

• 24 students do not have a cell phone

The total population of students was 380. Based on the data, what is the best approximation for the total

number of students who have a cell phone plan with company Y? Company X? no cell phone?

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  1. 26 September, 19:09
    0
    Company X - 190 students

    Company Y - 114 students

    No phones - 76 students

    Step-by-step explanation:

    1) Find a multiplier to get the ratio from sample to population; to compare the sample to the population

    380/120 = 3.16666667 or 3 & 1/6

    380 comes from the total population of students and 120 comes from the randomly selected.

    2) Use our multiplier to compare the results to the population

    People with Company X

    60 * 3.16667 = 190

    People with Company Y

    36 * 3.166667 = 114

    People with no cell phone

    24 * 3.166667 = 76.0000000001 = 76 (rounded)

    Double check

    190 + 114 + 76 = 380
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