E-Math: How to Use the Mean and Standard Deviation Formula (Plus: Calculator Shortcuts)

One of the first topics that many Secondary 4 E-Math students learnt is a statistics chapter known as Mean and Standard Deviation (SD for short).

The nice thing about this chapter is that the 2 most important formula are both available in the E-Math (subject code: 4016) formula sheet! No memorization required, just understanding of their usage.

In this post, I will illustrate 2 methods to get the answers for mean and SD for ungrouped data (refer to example). The 2 methods are manual and calculator.

Example:

Given 15, 6, 18, 9, 2 and 4, find the mean and standard deviation.

Calculator, Casio fx-85MS:

1. Mode, 2(SD)
2. Enter the data in this manner, 15, M+ follows by 6, M+...
3. To get mean: Press 'Shift', 2, 1,=
4. To get SD: Press 'Shift', 2, 2,=

Here are some additional information you can obtain using the calculator:

Answers obtained through both methods are the same. By knowing these 2 methods, you can use either to double check.

Related Post

E-Math: 5 Features of Box and Whisker Plot You Must Know Link to what was previously discussed in Statistics (an Elementary Math E-Math topic) in Drawing & Understanding of Cumulative Frequency, here...
Approved Calculator Models for O-Level Maths by Ministry of Education Singapore Last week, I was sharing with my O-Level E-Maths students on the calculation of mean and standard deviation by using the calculator. Almost everyone i...
E-Maths: Mensuration Formula Sheet I have compiled a 'cheat sheet' to find volume and surface area of cube cuboid prism cylinder pyramid cone sphere This will ...
Sec 2 to Sec 3: How To Prepare Yourself For Elementary Math I have earlier written an article on Sec 2 to Sec 3: How To Prepare Yourself For Additional Math For those who aren't taking additional math, how ...
E-Math: Summary of Cumulative Frequency & Box Whisker Plot I have previously written 2 posts: E-Math: Drawing and Understanding of Cumulative Frequency Curve (Step by step working included) In this pos...

Ai Ling Ong

Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

One Response to E-Math: How to Use the Mean and Standard Deviation Formula (Plus: Calculator Shortcuts)

1. steve okpachu says:

thank you for registering me. i love maths and want to improve my knowledge of o level maths.
kind regards,
steve okpachu