AI generatedStatisticsGCSE Higher

Estimating a frequency above or below a value

Estimating a frequency above or below a value.

  • Organise the data before calculating.
  • Check counts and totals, and keep units or context in your conclusion.
  • Choose a typical-value measure and a spread measure that suit the data.

Example 1

Estimate how many observations are greater than 5.

Straight-line interpolation between class-boundary points.102051015200
Straight-line interpolation between class-boundary points.
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.

Example 2

Estimate how many observations are greater than 25.

Straight-line interpolation between class-boundary points.10203040506051015200
Straight-line interpolation between class-boundary points.
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.

Your turn

Question 1

Estimate how many observations are greater than 21.

Straight-line interpolation between class-boundary points.1020305101520250
Straight-line interpolation between class-boundary points.
Check answer
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.
Question 2

Estimate how many observations are greater than 10.

Straight-line interpolation between class-boundary points.1020304050605101520250
Straight-line interpolation between class-boundary points.
Check answer
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.
Question 3

Estimate how many observations are greater than 18.

Straight-line interpolation between class-boundary points.102030405101520250
Straight-line interpolation between class-boundary points.
Check answer
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.
Question 4

Estimate how many observations are greater than 40.

Straight-line interpolation between class-boundary points.10203040506051015200
Straight-line interpolation between class-boundary points.
Check answer
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.
Question 5

Estimate how many observations are greater than 6.

Straight-line interpolation between class-boundary points.10205101520250
Straight-line interpolation between class-boundary points.
Check answer
Read the final cumulative frequency.Read how many values are at or below the threshold.
Above thresholdSubtract from the total.
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