Practice Problems (Junior Cert Mathematics): Flashcards

Most frequently occurring value

Find highest frequency, match to corresponding value

Average value; total sum divided by count

$\frac{\sum(\text{value} \times \text{frequency})}{\sum\text{frequency}}$

Middle value when data ordered from smallest to largest

9th value (odd number of values)

$\frac{\text{lower bound} + \text{upper bound}}{2}$

Mid-interval value of highest frequency interval

Mid-interval values, not endpoints

Find interval with middle position, use mid-interval value

Forgetting to multiply each value by its frequency first

Between 15th and 16th values (even number of values)