What is the mode?

Correct answer: c 55

The modal class is 50−59; f₁ = 10 − 6 = 4, f₂ = 10 − 6 = 4; 50 + 4/8 × 10 = 55.

Why the other options are wrong

• a 53: The modal class is 50−59; L = 50, f₁ = f₂ = 4, h = 10, so 50 + 5 = 55, not 53.
• b 54: 54 would need f₁/(f₁ + f₂) = 0.4; it is 0.5.
• d 56: 56 would need f₁/(f₁ + f₂) = 0.6; it is 0.5.