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1 answer:
Answer:
75.5
Step-by-step explanation:
To calculate the mean we use
mean =
To calculate the mean for class B we require their score
Using the mean for class A
= 67.8 ( multiply both sides by 25 )
score = 67.8 × 25 = 1695
Similarly using the mean for all 55 students
= 72 ( multiply both sides by 55 )
total score = 72 × 55 = 3960
Hence score for class B = 3960 - 1695 = 2265
mean for class B = = 75.5
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Answer:
Step-by-step explanation:
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