Question on: JAMB Mathematics - 1992
(\begin{array}{c|c} x & 2 & 4 & 6 & 8\ \hline f & 4 & y & 6 & 5 \end{array})
If the mean of the above frequency distribution is 5.2, find y
A
2, 1
B
1, 2
C
1, 5
D
5, 2
Ask EduPadi AI for a detailed answer
Correct Option: C
Mean (\bar{x}) = (\frac{\sum fx}{\sum f})
= (\frac{5.2}{1})
= (\frac{8 + 4y + 36 + 40}{4 + y + 6 + 5})
= (\frac{5.2}{1})
= (\frac{84 + 4y}{15 + y})
= 5.2(15 + y)
= 84 + 4y
= 5.2 x 15 + 5.2y
= 84 + 4y
= 78 + 5.2y
= 84 = 4y
= 5.2y - 4y
= 84 - 78
1.2y = 6
y = (\frac{6}{1.2})
= (\frac{60}{12})
= 5
Add your answer
Please share this, thanks!
No responses