Any value of the variable which makes both sides of an
equation equal, is known as a ______ of the equation.
Which of the following equations can be formed using
the expression x = 5:
(a) 2x + 3 = 13 (b) 3x + 2 = 13
(c) x – 5 = 1 (d) 4x – 9 =21
–1 is not a solution of the equation
(a) x + 1 = 0 (b) x – 1 = 2 (c) 2y + 3 =1 (d) 2p + 7 = 5
Observe the data and answer the questions that follow:
16, 15, 16, 16, 8, 15, 17
(a) Which data value can be put in the data so that the mode remains
the same?
(b) At least how many and which value(s) must be put in to change
the mode to 15?
(c) What is the least number of data values that must be put in to
change the mode to 17? Name them.
Given below are heights of 15 boys of a class measured in cm:
128, 144, 146, 143, 136, 142, 138, 129, 140, 152, 144, 140, 150,
142, 154.
Find
(a) The height of the tallest boy.
(b) The height of the shortest boy.
(c) The range of the given data.
(d) The median height of the boys.
The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.
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