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Statistics — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsStatistics1 Mark
MCQ
Observe the table given below and choose the correct alternative: The class mark for $R$ is:
Column
$P$
$Q$
$R$
$S$
$T$
$E$
Marks scored
$30-40$
$40-50$
$50-60$
$6-70$
$70-80$
$80-90$
Number if students
$4$
$8$
$12$
$10$
$7$
$4$
  • A
    $50$
  • B
    $45$
  • ✓
    $55$
  • D
    $60$
✓

Answer

Correct option: C.
$55$

Class mark $=\frac{\text{( upper limit + Lower limit ) }}{2}$
$=\frac{50+60}{2}$
$=\frac{110}{2}$
So class mark is $55.$

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