Question

If mean of 4,5,a,6,b,9 and 11 is 10 then find value of (a + b)
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Answer 1

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→If mean of 4,5,a,6,b,9 and 11 is 10 then find value of (a + b)

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⇒Given:

• Mean = 10

⇒To Find:

• (a+b)

⇒Solution:

⇒$Mean=\frac{{\text{Sum of Observations}}}{{\text{Number of Observations}}}$

⇒$10=\frac{35+a+b}{7}$

⇒$10\times 7=35+a+b$

⇒$70-35=a+b$

⇒$\huge{\pink{\overbrace{\underbrace{a+b=35}}}}$

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Answer 2

Answer:

mean=sum of observations/total number of observations

10 =4+5+6+9+11+a+b/7

10. =35+a+b/7

10*7 =35+a+b

70=35+a+b

70-35=a+b

35 =a+b

Step-by-step explanation:

therefore ,a + b is equal to 5

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