Answer to Question #90290 in Statistics and Probability for Sharon Tan

Question

Monthly Expenses (S$) Frequency
0 and less than 150 5
150 and less than 300 8
300 and less than 450 15
450 and less than 600 9
600 and less than 750 17
750 and less than 900 6
Total 60

If 80% of the monthly expenses is below $600, then it indicates that the XYZ has not been overspending. From the above grouped data, would you say that XYZ has been overspending? show your calculation.

Answer 1

$Monthly \ Expenses \ (S \$) \ \ \ \ Frequency$ $\ \ 0\leq S<150 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 5$ $150\leq S<300 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 8$ $300\leq S<450 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 15$ $450\leq S<600 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 9$ $600\leq S<750 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 17$ $750\leq S<900 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 6$

Total 60 

$S<600: \ 5+8+15+9=37$

$80 \% \ of \ 60=48>37$

We would say that XYZ has been overspending.