OCR A-Level Business (H431) H431
Introduction to Business
Business Objectives and Strategy
External Influences
Accounting and Finance
Human Resources
Marketing
Operations Management
Marketing
Normal distribution and standard deviation
- 2 things to know
- Components 01, 02 and 03
Overview
Recall questions on the normal distribution and its use in marketing, standard deviation and what a small value shows, the 68% and 99.7% rules, calculating ranges and a standard deviation, planning stock, comparing samples with the same mean, delivery times, and the limitations of standard deviation.
What you need to know
Answer each one before you reveal it.
What is a normal distribution?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a normal distribution?
Model answer
A normal distribution is a symmetrical, bell-shaped distribution in which most values cluster around the mean, and the mean, median and mode coincide.
- 2
Why is the normal distribution useful to a marketing manager?
Model answer
Many measures such as spend per customer or units sold per week cluster around an average, so the pattern lets the business estimate how likely a given outcome is.
- 3
What is standard deviation?
Model answer
Standard deviation is a measure of how widely the values in a data set are spread around their mean.
- 4
What does a small standard deviation in customer spending tell a business?
Model answer
It shows that spending is tightly clustered near the average, so customers behave similarly and demand is easier to plan for.
- 5
In a normal distribution, what proportion of values lies within one standard deviation of the mean?
Model answer
About 68% of values lie within one standard deviation of the mean.
- 6
In a normal distribution, roughly what proportion of values lies within three standard deviations of the mean?
Model answer
About 99.7% of values lie within three standard deviations of the mean.
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