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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.

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Key term

Why does standard deviation matter when two research samples report the same mean?

Key term

What is a normal distribution?

Questions from this subtopic

Each one with the model answer underneath.

  1. 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. 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. 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. 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. 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. 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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Revenue the cost of sales.
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