A delay in production for some days in a factory due to electric fault is:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → irregular trend
A time series has four kinds of movement: the long-term trend, cyclical changes (business cycles over several years), seasonal changes (a pattern repeating within each year) and irregular changes.
An electric fault is sudden and unpredictable, and the delay lasts only a few days. It follows no pattern, so it is an irregular (random) variation.
CBSE Applied Mathematics (Class XII):
Index Numbers and Time-based Data
