Question

The average marks of a student in 4 subjects is 75 if the student obtained 80 marks in the fifth subject the new average is opt. 1) 80 2)92 3)76 4)95

Answer 1

marks obtained in 4 subject = 4× 75 = 300
now, marks in fifth subject = 80
total marks in 5 subjects become= 300 +80 = 380
average = 380/5 =76

Answer 2

Answer:

$\red { New \: average } \green {=76}$

Step-by-step explanation:

$Given \: the\: average\: marks \:of \:a \\student\: in\: 4 \:subjects \:is\:75$

$\boxed { \pink { Average = \frac{sum\:of \:the\: marks }{Number \: of \: students }}}$

$Sum \: of \: the \: marks \: in \: 4 \: subjects\\ = 4\times 75\\= 300$

$If \: the \: student \: obtained \: 80\:marks \\in \: the \: fifth \: subject$

$Sum \: of \: the \: marks \: in \: 5\: subjects\\= 300 + 80\\= 380$

$\implies New \: average = \frac{380}{5} = 76$

Therefore.,

$\red { New \: average } \green {=76}$

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