मराठी

Find the Mean of Each of the Following Frequency Distributions Classes: 25 -29 30-34 35-39 40-44 45-49 50-54 55-59 - Mathematics

Advertisements
Advertisements

प्रश्न

Find the mean of each of the following frequency distributions

Classes 25 - 29 30 - 34 35 - 39 40 - 44 45 - 49 50 - 54 55 - 59
Frequency 14 22 16 6 5 3 4
Advertisements

उत्तर

Let the assume mean A = 42

Classes Mid value(x1) d1 = x1 - 42 `"u"_1=(x1-42)/5` f1 f1u1
25 - 29 27 -15 -3 14 -42
30 - 34 32 -10 -2 22 -44
35 - 39 37 -5 -1 16 -16
40 - 44 42 0 0 6 0
45 - 49 47 5 1 5 5
50 - 54 52 10 2 3 6
55 - 59 57 15 3 4 12
        N = 70 `sumf_1"u"_1=-79`

We have

A = 42, h = 5

Mean `=A+hxx(sumf_1"u"_1)/N`

`=42+5xx(-79)/70`

`=42+(-395)/70`

`=42-395/70`

= 42 - 5.643

= 36.357

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 15: Statistics - Exercise 15.3 [पृष्ठ २३]

APPEARS IN

आरडी शर्मा Mathematics [English] Class 10
पाठ 15 Statistics
Exercise 15.3 | Q 14 | पृष्ठ २३
Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×