Question

the mean marks obtained by 90 students are 59.there are 40 girls students.if mean marks of the girls student are 64,obtain the mean marks of boy students

Answer 1

Step-by-step explanation:

Hence this is the answer of your Question .

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Answer 2

Given:

Average marks of ninety students $= 59$

Average marks of forty students $= 64$

To find:

To find the average marks of boys

Step-by-step explanation:

• We need to find the average of boys' marks.
• We can do this by applying the formula.

Solution:

Average $= \frac{Number of observations}{Total number of observations}$

$59 =\frac{x}{90}\\\\x = 59*90\\\\x = 5310$

Average of girl's students

$64 = \frac{y}{40}\\\\y = 64*40\\\\y= 2560$

Average marks of boys:

$5310 - 2560\\\\= 2750$