Question

10. Find the mean weight of 70 students from the following data: Weight (in kg) 50 52 54 56 58 60 62 64 No. of students 8 10 15 20 8 6 2 1​

Answer 1

Step-by-step explanation:

Rearranging the data into ascending order, we get 

54,57,59,60,62,62,62,65,70,75,84

Here,

(a) Mean = Sum of observations ÷ number of observations

=1254+54+57+59+60+62+62+62+65+70+75+84

=12788=65.6 kg

(b) 4 people have a weight above the mean weight.

(c) Range = greatest observation − lowest observation  

=84−54=30 kg

Answer 2

Step-by-step explanation:

55.17. Step-by-step explanation: Xi=50,52,54,56,58,60,62,64. fi=8,10,15,20,86,2,1. fiXi=400,520,810,1120,464,360,124,64.