Question

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Answer 1

Step-by-step explanation:

$mean \: = \frac{sum \: of \: all \: observations \: }{total \: number \: of \: observations}$

$a. \: \: \: \: \frac{35 + 40 + 45 + 65 + 39 + 20}{6}$

$\implies \: \frac{244}{6}$

$\implies \: 40.7$

$b. \: \: \: \: \frac{10 + 20 + 30 + 40}{4}$

$\implies \: 25$

Answer 2

EXPLANATION.

Question = 1.

Batsman scored the following number of runs.

35, 30, 45, 65, 39, 20.

As we know that,

Mean = Sum of all the observation/the number of observation.

Sum of all observation = 35 + 30 + 45 + 65 + 39 + 20 = 234.

Number of observation = 6.

⇒ Mean = 234/6.

⇒ Mean = 39.

Option [A] is correct answer.

Question = 2.

Mean number of 10, 20, 30 and 40.

As we know that,

Mean = Sum of all the observation/the number of observation.

Sum of observation = 10 + 20 + 30 + 40 = 100.

Number of observation = 4.

⇒ Mean = 100/4.

⇒ Mean = 25.

Option [B] is correct answer.