Start learning →

If each observation multiplied by 3, SD becomes:

A3× original
BSquared
C9×
DSame
Answer & Solution
Correct answer: A. 3× original
SD(aX) = |a| × SD(X). Multiplying by 3 multiplies SD by 3. Variance multiplies by 9. Useful for unit conversions.
Practise this question with Quill — CAT →

Keep practising CAT QA — Mixed

Browse all CAT QA — Mixed questions for CAT, or explore more Quantitative Aptitude topics.

Start a CAT QA — Mixed lesson →
Related questions
Pythagorean triplet (3, 4, ?): missing value:Volume of a cylinder with radius 3 and height 10:Circumference of circle with radius 7:Geometry: Area of equilateral triangle with side 6 cm:Remainder when 7^100 is divided by 5:If log_2(x) = 5, then x =Log base 10 of 1000:Sum and product of roots of x² + 7x + 12 = 0: