The Thomas Supply Company Inc. Is a distributor of gas-powered generators. As with any business, the length of time customers take to pay their invoices is important. Listed below, arranged from smallest to largest, is the time, in days, for a sample of the Thomas Supply Company Inc. Invoices.

(a) 31 , 54

(b) 48

Explanation:

(a) Locator: 0.2*30 = 6

    Round up to 7

    20% decile = 31

    Locator: 0.8*30 = 24

    Round up to 25

    80% decile = 54

(b) To determine 67th percentile

    Locator : 0.67^30 = 20.1

    Round up to 22

    67% percentile = 48

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