Type A and type B batteries were tested This cumulative frequency diagram shows information about the battery life of type A batteries.
a) estimate the interquartile range for type A
b) Estimate the number of type A batteries
that had a life of more than 1600 hours.
Type A
80
c) The box plot shows information about the
70
battery life of type B batteries.
Type B
A
60
50
Cumulative frequency
40
30
20
800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800
Battery life (hours)
Using information from both diagrams write
down the median battery life for each type.
Type A hrs Type B
Total marks: 5
10
hrs (2)
900 1000 1100 1200 1300 1400 1500 1600 1700 1800
Battery life (hours)

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below:

2.83941151 would be the answer you're looking for! : )

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.