The mean height of 5 students of a class is 155 cm. Two new students join the group. If their heights are 146 cm and 150 cm, then find the mean height of group of 7 students.
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let the students be a,b,c,d,e
so
a+b+c+d+e/5=155
a+b+c+d+e=775
now two students G and T are involve then
a+b+c+d+e+G+T/7=X
x=775+146+150/7
X=1071/7
X=153.
hope it will help you.
so
a+b+c+d+e/5=155
a+b+c+d+e=775
now two students G and T are involve then
a+b+c+d+e+G+T/7=X
x=775+146+150/7
X=1071/7
X=153.
hope it will help you.
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