Question

Class 9th
Mathematics
Chapter 14 - Statistics
Formulas Needed . Give 1 example for each Formuals

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Answer 1

Answer:

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Answer 2

Answer:

All formulas are given below:-

Step-by-step explanation:

• Mean or M = Sum of all observation / Total number of observations.

MEDIAN

When the number of observations (n) is odd

= value of the n+1/2th observation (term)

When the number of observations (n) is even

MEDIAN = ½[n/2th observation ( term) + {n/2+1} observation (term)

Example:-

If all values of a variable are: 5,10,3,7,2,9,6,2,11, then arranging them in ascending order. Find the median.

Ans.:- Arranging them in ascending order they become:- 2, 2, 3, 5, 6, 7, 9, 10, 11.

Here, value 6 of the variable is such that number of observations less than 6 us 4 and number of observations greater than 6 is also 4.

Hence,. median = 6

Here, number of observations n = 9 (odd)

Clearly, Median = value of 9 + 1/2th i.e., 5th observations.

= 6

MODE:-

Formula:- Most occurring term.

Example,:-

Find the mode:+ 7, 9, 12, 13, 7, 12, 15, 7, 12, 7, 25, 18, 7.

Ans :- Here observation 7 has maximum frequency 5.

mode- 5.

F