JEE Mains 06-Sep-2020 Shift 2 Solved Paper

A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50‌mm,5.55‌mm,5.45‌mm;5.65‌mm. The average of these four readings is 5.5375‌mm and the standard deviation of the data is 0.07395‌mm. The average diameter of the pencil should therefore be recorded as :