The heights, in cm, of 50 students are recorded and used to draw the cumulative frequency graph shown below.
50
Submit Answer
30
Cumulative frequency
Use the graph to estimate the number of
these students with a height above 150 cm.
20
10
students
120
130
150
160
170

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116