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son4ous [18]
3 years ago
14

the average marks of the first 10 students are 17 and that of the next 15 students is 18. find the mean of 25 students?

Mathematics
1 answer:
Alex787 [66]3 years ago
6 0

Answer:

20

_____

10 = 17

15 = 18

20 = 19

25 = 20

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d 64

Step-by-step explanation:

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Step-by-step explanation:

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Answer:

a.   $14.50

b.  $43.5

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2 years ago
(c) The total number of one centimeter lines in the first n diagrams is given by the expression
trapecia [35]

Answer:

I) f + g = 10/3

II) 4f + 2g = 20/3

III) f = 2 and g = 4/3

Step-by-step explanation:

From the chart,

P = 25

q = 40

The total number of one centimeter lines in the first n diagrams is given by the expression 

2/3n^3 + fn^2 + gn. 

When n = 1, the total number of line = 4. So,

2/3(1)^3 + f(1)^2 + g(1) = 4

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f + g = 4 - 2/3

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f + g = 10/3 × 2

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3 years ago
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