Question

the mean of two groups of 15 and 20 observation are 20 and 25 respectively. find the mean of all the 35 observation​

Answer 1

Answer:

22.8

Step-by-step explanation:

the mean of two groups of 15 and 20 observation are 20 and 25 respectively. find the mean of all the 35 observation

Answer 2

Answer:

22.8

Step-by-step explanation:

sum of 15 observations 300

sum of 20 observations 500

total sum 800

mean of 35 observations 800/35

=22.8

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