Junior Cycle · Statistics
⏱ Tested in 2 exam questions since 2023
Lesson 9 of 14
JCHL Statistics 9: Frequency Tables
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- A frequency table lists each value (or interval) and how many times it happened (the frequency)
- Mid-interval value = the middle of an interval, e.g. 0-10 has a mid-interval value of 5. Use them to estimate the mean of grouped data
- Mean from a table = add up (frequency x value), then divide by the total number of people
Formula used
x̄ ≈ (Σ (mid-interval × f))/(Σ f)
Most recent exam questions
- 2024 Q2(a)
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