T STATISTICS
1. Mean of 21, 30, 22, 16, 24, 28, 18, 17 is.... 60
20
2. Mean of 12 numbers is 20. If each number is multiplied by 6, then the new mean is ..........
3. If arithmetic mean of 30 number is 16. If each number is divided by 4, then the new mean is....
4. Find the arithmetic mean of 25, 32, 36, 38, 45, 41, 35, 36 votos
5. Find the arithmetic mean of 23, 30, 34, 36, 43, 39, 33, 34
6. Find the arithmetic mean of 4, 12, 20, 28, 36, 44
( for class 9 maths)
Answers
Answer:
Correct option is
Correct option isD
Correct option isD45
Correct option isD45Mean of 10 number is 20.
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450Now, new mean =
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450Now, new mean = 10
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450Now, new mean = 10450
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450Now, new mean = 10450
Correct option isD45Mean of 10 number is 20.Sum of 10 numbers = 200When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450Now, new mean = 10450 =45
Step-by-step explanation:
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Question 1) :- Mean of 21, 30, 22, 16, 24, 28, 18, 17 is....?
Solution :-
we know that,
- Mean = sum of observations / total number of observations.
so,
→ Mean = (21 + 30 + 22 + 16 + 24 + 28 + 18 + 17) / 8
→ Mean = 176/8
→ Mean = 22 (Ans.)
Question 2) :- Mean of 12 numbers is 20. If each number is multiply by 6, find the new mean ?
Solution :-
we know that,
- If we multiply constant value in each value, we have to multiply it by mean also .
so,
→ New mean = Old mean * k (constant value)
→ New mean = 20 * 6
→ New mean = 120 (Ans.)
Question 3) :- If arithmetic mean of 30 number is 16. If each number is divided by 4, then the new mean is....?
Solution :-
→ New mean = old mean ÷ k (constant value)
→ New mean = 16 ÷ 4
→ New mean = 4 (Ans.)
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