Find the mean height of $100$ trees:

74

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70

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71

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72

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Solution

The correct option is A $74$ m
Arithmetic mean using direct method formula is $¯ x = \frac{\sum f_{i} x_{i}}{\sum f_{i}}$
$¯ x = \frac{7, 360}{100}$
$¯ x = 73.60$ .
Therefore, the average height is approximately $74$ m.

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Similar questions

If the distance between the top of two trees of height 20 m and 28 m is 17 m, then the horizontal distance between the trees is:

88 m

72^{\circ}

(π = \frac{22}{7})

\begin{matrix} Tree & Height(m) & Distance from the eye(m) A & 2.0 & 50 B & 2.5 & 80 C & 1.8 & 70 D & 2.8 & 100 \end{matrix}

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