Sixteen students each measured the weight of 25 pennies, in grams. the list shows their measurements. 60, 62, 65, 59, 63, 63, 63, 62, 64, 62, 60, 61, 66, 64, 61, 65 in each graph below, the mean is indicated by a solid vertical line segment while the standard deviations from the mean are indicated by dotted vertical line segments. which graph represents the distribution of weights?

Graph number 3.

Step-by-step explanation:

From the given data we will calculate the mean first

Mean = ∑Measurements/number of students = (60+62+65+59+63+63+63+62+64+62+60+61+66+64+61+65)/16 = 1000/16 = 62.5

Now to calculate standard deviation

Standard deviation =

So on the graph a solid vertical line should be at 62.5 and dotted vertical line segments will be at 60.5 and 64.5

The figure which matches our data is graph number 3.

Therefore Graph number 3 is the answer.

answer:

c 60% on edg

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.