Question

if the mean of the following frequently distribution is 7.2 find the values of K xi 2,4,6,8,10,12fi4,7,10,16,k,3​

Answer 1

Answer:

Fx = 8, 28, 60, 128, 10k, 36

Sum of Fx = 260 + 10k

Sum of F = 42

Mean = 7.2

Step-by-step explanation:

$mean = \frac{sum \: of \: fx}{sum \: of \: f} \\ \\ 7.2 = \frac{ 260 + 10k}{42} \\ \\ 7.2 \times 42 = 260 + 10k \\ \\ 302.4 = 260 + 10k \\ \\ 302.4 - 260 = 10k \\ \\ 42.4 = 10k \\ \\ \frac{42.4}{10} = k \\ \\ k = 4.24$

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