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morpeh [17]
3 years ago
14

I will mark brainliest please help me​

Mathematics
1 answer:
Lapatulllka [165]3 years ago
4 0

Answer:

Formula for mean in grouped data

= Zfx/ Zf

f = sum of the number of mice

= 35

Frequency = 39 + x

Mean = 7

Fx = 20 + 78 + 112 + 8x + 54

= 264 + 8x

7 = 264 + 8x/ 39 + x

7(39+x) = 264 + 8x

After solving you will get

x = 9

Hope this helps.

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