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ഒരു കുട്ടിക്ക് ഒരു പരീക്ഷയിൽ ഗണിതം, ഹിന്ദി , ഇംഗ്ലീഷ്, രസതന്ത്രം എന്നിവക്ക് ലഭിച്ച സ്കോറുകൾ യഥാക്രമം 88,90,100,60 എന്നിവയാണ് . ഇവയുടെ ക്രെഡിറ്റുകൾ യഥാക്രമം 2, 5 ,3 ,2 ആയാൽ മാധ്യം കാണുക.

A76.8

B87.16

C65.75

D91.2

Answer:

B. 87.16

Read Explanation:

X̄= Σwx / f

w1=2;x1=88;w1x1=176w_1 = 2; x_1= 88; w_1x_1=176

w2=5;x2=90;w2x2=450w_2 = 5; x_2= 90; w_2x_2=450

w3=3;x3=100;w3x3=300w_3 = 3; x_3= 100; w_3x_3=300

w4=2;x4=60;w4x4=120w_4 = 2; x_4= 60; w_4x_4=120

X̄= 196+450+300+1202+5+3+2\frac{196+450+300+120}{2+5+3+2}

X̄=87.16


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