What is Arithmetic mean?

$\bar{x}=\dfrac{1}{n}\sum_{i=1}^n x_i$

middle value; average two middle values if even $n$

most frequent observation; may be none or multiple

What is Geometric mean?

$G=\left(\prod_{i=1}^n x_i\right)^{1/n}$ for positive data

$\text{MD}=\dfrac{1}{n}\sum|x_i-\bar{x}|$

Updated 8/25/2026

Test · 20 questions · first 3 free

Question 1 of 30%

In the four parts of hypothesis testing, if the test statistic falls into the rejection region, the null hypothesis is rejected.

80 cards · first 3 free, no account

1 / 80

What is the formula for the arithmetic mean of grouped data using class marks and frequencies?

Arithmetic mean = (Σ f x) / n where x is the class mark (midpoint), f is class frequency, and n is total observations.

Spacebar to flip · Arrows to navigate

Tap to flip · Swipe to navigate

80 flashcards and a test with explanations for this topic. The account is free and you pick up right where you left off.