GATE 2024 IN – Question 28
A 20 kΩ resistor is measured six consecutive times using an LCR meter. The first five readings are 19, 18, 23, 21, and 17 kΩ. If the mean equals the true resistance, the last reading is ______ kΩ (nearest integer).
Practise this question in The GATE Grind →
Show answer and explanation
Correct answer: 22 to 22
Explanation
Six readings with mean 20 kΩ must sum to 120 kΩ. The first five sum to $19+18+23+21+17=98$ kΩ.
Thus the missing reading is $120-98=\boxed{22}$ kΩ.