the mean of 7 observations is 64. if the sum of first 4 and last 4 observations is 278 and 267 find the fifth observation​

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the mean of 7 observations is 64. if the sum of first 4 and last 4 observations is 278 and 267 find the fifth observation​

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Harper 2 weeks 2021-10-08T05:07:17+00:00 1 Answer 0 views 0

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    2021-10-08T05:09:02+00:00

    Answer:

    11

    Step-by-step explanation:

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18:9+8+9*3-7:3-1*13 = ? ( )