STA104 WEEK 4

First Class:

LEARNING OBJECTIVE 1: 

Measures of Central Tendency (Mean, Median, Mode)

Students need to know how to calculate mean, median, mode for ungrouped data using function in scientific calculator.

👉🏼 Watch Video V1W4.

👉🏼 Refer Pg.45 (formula and steps to calculate mean, median and mode)

👉🏼 Refer Pg.52 - 53 (guide to use scientific calculator)

👉🏼 Do Example 21 Pg.46

👉🏼 Do Exercise 1(a) Pg.57

      Answer: 

      Mean = 224.8 (The average weekly sales of the company is RM 224 800)       

      Median = 223 (Half of the weekly sales of the company is more RM223 000)

      Mode = 222 (Most of the weekly sales of the company is RM222 000)

LEARNING OBJECTIVE 2:

Measures of Dispersion (Variance and Standard Deviation)

Students need to know how to calculate measures of dispersion (standard deviation and variance) for ungrouped data using formula and function in scientific calculator.

👉🏼 Watch Video V1W4.

👉🏼 Refer Pg.47 (formula).

👉🏼 Refer Pg.52 - 53 (guide how to use scientific calculator).

👉🏼 Do Example 22 Pg.47

      Answer: 

      Variance = 7015.4667         

      Standard Deviation = 83.7584

👉🏼 Do Exercise 1(b) Pg.58

       Answer: 

      Variance = 24.8444       

      Standard Deviation = 4.9844

Second Class:

LEARNING OBJECTIVE 3:

Measures of Central Position (First, Second and Third Quartile)

Students need to know how to calculate measures of central position (first, second and third quartiles) and for ungrouped data.

👉🏼 Watch Video V3W4.

👉🏼 Refer Pg.50 (formula and steps to calculate first, second and third quartiles).

👉🏼 Do Example 23 Pg.51

      Answer: 

      Q1 = 27.75 

      Q2 = 36    

      Q3 = 40.75

      IQR = 13

      QD = 6.5

👉🏼 Do Exercise 1(d), (e) Pg.58

       Answer: 

      Q1 = 222 (75% of weekly sales of the company is more than RM 222 000)       

      Q3 = 228 (25% of weekly sales of the company is more than RM 228 000)

      IQR = 6

      QD = 3