Mean and Median
ICSE · Class 9 · Mathematics
Flashcards for Mean and Median — ICSE Class 9 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allFind the mean of 146, 154, 153, 160, 157, 160.
Answer
Step 1: Add the observations: 146 + 154 + 153 + 160 + 157 + 160 = 930 Step 2: Count the observations: n = 6 Step 3: Divide sum by n: mean = 930 ÷ 6 = 155 Answer: 155…
Find the mean of 23, 29, 31, 37, 41, 43, 47.
Answer
Step 1: Add the numbers: 23 + 29 + 31 + 37 + 41 + 43 + 47 = 251 Step 2: Count the observations: n = 7 Step 3: Mean = 251 ÷ 7 = 35 6/7 Answer: 35 6/7…
Apply the mean formula to 5, 6, 17, 8, 9, 15, 23, 18, 10, 24.
Answer
Step 1: Add all observations: 5 + 6 + 17 + 8 + 9 + 15 + 23 + 18 + 10 + 24 = 135 Step 2: Count observations: n = 10 Step 3: Mean = 135 ÷ 10 = 13.5 Answer: 13.5…
What is the mean after every observation in 5, 6, 17, 8, 9, 15, 23, 18, 10, 24 is increased by 3?
Answer
Original mean = 13.5 Property 2: when each observation is increased by 3, the mean also increases by 3 New mean = 13.5 + 3 = 16.5 Answer: 16.5…
What is the mean after every observation in 5, 6, 17, 8, 9, 15, 23, 18, 10, 24 is decreased by 2?
Answer
Original mean = 13.5 Property 3: when each observation is decreased by 2, the mean also decreases by 2 New mean = 13.5 - 2 = 11.5 Answer: 11.5…
What is the mean after every observation in 5, 6, 17, 8, 9, 15, 23, 18, 10, 24 is multiplied by 4?
Answer
Original mean = 13.5 Property 4: when each observation is multiplied by 4, the mean is also multiplied by 4 New mean = 13.5 × 4 = 54 Answer: 54…
What is the mean after every observation in 5, 6, 17, 8, 9, 15, 23, 18, 10, 24 is divided by 5?
Answer
Original mean = 13.5 Property 5: when each observation is divided by 5, the mean is also divided by 5 New mean = 13.5 ÷ 5 = 2.7 Answer: 2.7…
Solve: The mean of 7, 5, 8, p, 11 is 8. Find p.
Answer
Step 1: Write the mean equation (7 + 5 + 8 + p + 11) ÷ 5 = 8 Step 2: Multiply by 5 31 + p = 40 Step 3: Subtract 31 p = 9 Answer: 9…
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