Practice30 Create account

What is the standard deviation of 1, 3, 5 and 7 (use n as the divisor)?

Competition practiceStatistics

A5
B2
C $20$
D $5$

Step-by-Step Solution

Mean

= 4

. Squared deviations 9, 1, 1, 9 add to 20; variance

= \frac{20}{4} = 5

, so SD

= 5

. (5 is the variance;

20

forgets to divide by n.)

Answer: D)

5

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Statistics practice questions

More Statistics practice

Group A has a smallest value of 15 and a range of 20. Group B's values run from 22 to…A data set has lower quartile 20 and upper quartile 30. Calculate the coefficient of…The standard deviation of 1, 2, 3, …, 10 is about 2.87. Without recalculating, give the…Two machines fill sugar packets. Machine A: mean 500 g, SD 4 g. Machine B: mean 250 g,…The standard deviation of 2, 4, 6, 8 and 10 is 2√2. What is the standard deviation of…