Question

9. The heights of 10 girls were measured in cm and the results are as follows:
135, 150, 139, 128, 151, 132, 146, 149, 143, 141.
(1) What is the height of the tallest girl? (i) What is the height of the shortest girl?
(ii) What is the range of the data? (iv) What is the mean height of the girls?
(v) How many girls have heights more than the mean height.​

Answer 1

Answer:

Solution:

i) Height of tallest girl = 151 cm

ii) Height of shortest girl = 128 cm

iii) Range = Height of tallest girl - shortest girl

iv) Mean height = \frac{Sum\ of\ all\ heights}{Number\ of\ girls}

Number of girls

Sum of all heights

= \frac{135\ +\ 150\ +\ 139\ +\ 128\ +\ 151\ +\ 132\ +\ 146\ +\ 149\ +\ 143\ +\ 141}{10}\ =\ \frac{1414}{10}

10

135 + 150 + 139 + 128 + 151 + 132 + 146 + 149 + 143 + 141

=

10

1414

= 141.4 cm