4. Thirty Asian Utility vehicles were tested for biodiesel fuel efficiency (in km/liter). The following frequency distribution was obtained. Class Boundaries 7.5-12.5 12.5-17.5 17.5-22.5 22.5-27.5 27.5-32.5 Frequency 3 15 a. Calculate the variance and standard deviation for this grouped data. b. Find Pso. c. Find Prs.

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