Which situation involves descriptive statistics? a) to determine how many outlets might need to be changed, an electrician inspected 20 of them and found 1 that didn’t work. b) ten percent of the girls on the cheerleading squad are also on the track team. c) a survey indicates that about 25% of a restaurant’s customers want more dessert options. d) a study shows that the average student leaves a four-year college with a student loan debt of more than $30,000.

b) Ten percent of the girls on the cheerleading squad are also on the track team.

Step-by-step explanation:

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reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.