Problem 429

 

Fiona kept the following records of her phone bills for 12 months:

55,  50,  64,  54,  71,  57,  55,  48,  66,  71,  59,  70

 

Find the mean and median of Fiona’s monthly phone bills.

 

Solution:-

 

First arrange the values in ascending order which is given bellow

48,  50,  54,  55, 55, 57, 59, 64, 66, 70, 71, 71

Mean=sum of terms /number of terms

Sum of terms=48+50+54+55+55+57+59+64+66+70+71+17=720

Number of terms=12

So mean=\frac{720}{12}= 60

When the number of values of even then medain =avarge of = \frac{n}{2} th term  and (\frac{n}{2})+1 th term

Where n=number of terms

So here medain=[\frac{12}{2}   + (\frac{12}{2}  )+1]/2=\frac{(6 th term+7 th term)}{2}

6 th term is  57

7 th term is  59

So median=\frac{(57+59) }{2}   = 58

Leave a Reply

Your email address will not be published. Required fields are marked *