Data Handling
ICSE · Class 7 · Mathematics
Flashcards for Data Handling — ICSE Class 7 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.
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A class test has these marks: 43, 29, 9, 37, 23, 25, 16, 45, 16, 25, 23, 5, 14, 12, 16, 21, 21, 23, 21, 44, 45, 16, 45, 37, 23, 25, 37, 9, 5, 25. Write them in ascending order.
Answer
Step 1: Start with the smallest numbers. Step 2: Arrange all numbers from least to greatest. Answer: 5, 5, 9, 9, 12, 14, 16, 16, 16, 16, 21, 21, 21, 23, 23, 23, 25, 25, 25, 25, 29, 37, 37, 37, 43, 44,…
Find the range of these numbers: 68, 76, 63, 75, 93, 83, 70, 115, 82, 105, 90, 103, 92, 52, 99, 73, 75, 63, 77, 71.
Answer
Step 1: Find the largest number = 115. Step 2: Find the smallest number = 52. Step 3: Use the formula: Range of given numbers = Largest number – smallest number. Step 4: Range = 115 - 52 = 63. Answer:…
Make a frequency distribution table for the numbers 4, 4, 5, 6, 7, 6, 5, 4, 4, 7, 8, 5, 7, 5, 5, 4, 6, 6, 5, 8.
Answer
Step 1: List the different values in order: 4, 5, 6, 7, 8. Step 2: Count how many times each value occurs. Step 3: Write the frequency table. Value | Frequency 4 | 5 5 | 6 6 | 4 7 | 3 8 | 2 Answer: T…
Why is a frequency distribution table useful for raw data?
Answer
Raw data is hard to read when there are many numbers. A frequency table groups the numbers and shows how often each value occurs. Example: In the data 4, 4, 5, 6, 7, 6, 5, 4, 4, 7, 8, 5, 7, 5, 5, 4, 6…
Find the mean of 26, 25, 40, 36, 50 and 45.
Answer
Step 1: Add all observations. 26 + 25 + 40 + 36 + 50 + 45 = 222 Step 2: Count the observations = 6 Step 3: Use the formula: Mean = Sum of all observations / Number of observations Step 4: Mean = 222 /…
Find the mean of 01, 06, 16, 10, 09, 23, 18, 27, 20, 17, 02, 22, 15, 12, 21, 25 and 11.
Answer
Step 1: Add all observations. 01 + 06 + 16 + 10 + 09 + 23 + 18 + 27 + 20 + 17 + 02 + 22 + 15 + 12 + 21 + 25 + 11 = 255 Step 2: Count the observations = 17 Step 3: Mean = 255 / 17 Step 4: Mean = 15 Ans…
Find the mean of the first 8 natural numbers.
Answer
Step 1: Write the numbers: 1, 2, 3, 4, 5, 6, 7, 8 Step 2: Add them: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36 Step 3: Count them: 8 Step 4: Mean = 36 / 8 = 4.5 Answer: 4.5…
Find the mean of the first seven whole numbers.
Answer
Step 1: Write the numbers: 0, 1, 2, 3, 4, 5, 6 Step 2: Add them: 0 + 1 + 2 + 3 + 4 + 5 + 6 = 21 Step 3: Count them: 7 Step 4: Mean = 21 / 7 = 3 Answer: 3…
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