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Birthday Data Handling

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Birthday Data Handling

An aquarium team recorded the birthday months of a group of sea-life helpers. Use the data to count, compare and talk about birthdays. For tally marks, group each set of five with the fifth mark crossing the first four.

Meet the birthday helpers

The helpers' birthday months are: January, March, March, May, June, June, June, August, September, September, November, December.

1.How many helpers' birthdays are in the data set? Count the month names.

2.Complete the tally chart for these months. Add tally marks and write the total for each month.

Month

Tally marks

Total

January

March

June

September

December

3.Which month has the most birthdays in the data set?

4.Which two months are tied for the second-highest number of birthdays?

5.Which month has the fewest birthdays among the months listed in the tally chart?

January and December
June
March and September

6.How many more birthdays are in June than in January?

7.True or false: More helpers have birthdays in March than in December.

TrueFalse

8.The aquarium team wants to find out the birthday month of each new helper. What should they do to collect reliable data?

Ask each helper which month they were born in
Guess from their favourite fish
Count the number of aquariums

9.Name one month not in the tally chart that has no birthday in this data set.

10.Complete the sentence: In this data set, the month with the most birthdays is .

11.Draw a simple picture graph to show the birthday totals for January, March, June, September and December. Use one star symbol for each birthday and label each month.