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ExtremeBDS [4]
3 years ago
12

Can someone help me with this question please.....

Mathematics
1 answer:
Alex73 [517]3 years ago
7 0

Answer:

y = 541

Step-by-step explanation:

The mean is calculated as

mean = \frac{sum}{count}

Mean of set A = \frac{281+268+225+290}{4} = \frac{1064}{4} = 266

ratio between means = 7 : 12, then

mean of set B = \frac{12}{7} × 266 = 456 , thus

\frac{392+512+413+422+y}{5} = 456 ( multiply both sides by 5 )

1739 + y = 2280 ( subtract 1739 from both sides )

y = 541

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