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NCERT Exemplar Solutions Class 9 Mathematics Solutions for Statistics and Probability - Exercise 14.1 in Chapter 14 - Statistics and Probability
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A grouped frequency table with class intervals of equal sizes using 250-270 (270 not included in this interval) as one of the class interval is constructed for the following data :
268, 220, 368, 258, 242, 310, 272, 342,
310, 290, 300, 320, 319, 304, 402, 318,
406, 292, 354, 278, 210, 240, 330, 316,
406, 215, 258, 236.
The frequency of the class 310-330 is:
(A) 4
(B) 5
(C) 6
(D) 7
Answer:
(C) 6
Explanation:
Arranging the following data in a table, we get,
Therefore, we get from the above table,
The frequency of the class 310-330 is = 6
Hence, option (C) is the correct answer.
Video transcript
"hello student welcome to the leader
doubt solving session
and in today's session we are going to
solve one question
related to frequency distribution all
right
okay so some data is given here
right a few numbers are given here and
okay with this given data we need to
find it out the
frequency of the class 310 to
330. all right
okay so let's solve this question
okay so okay according to the question
okay uh one of the class interval is
given
here right so the given class interval
given class
interval okay that is
250 to
270 all right
okay which is given here and that's why
okay what we will do will quickly okay
find out the
size okay size of the class okay so size
will be
270 minus
250 which is equal to
20 all right
so this will be the size okay now
i'm going to find out okay
we are going to find out okay
the frequency for the class of right
okay
we are going to find out
we are going to
to find frequency
for okay class interval of
class
interval of
310 to 330
all right okay so what i will do
okay i will find out the numbers between
the this class right
so okay numbers
i will find out the values okay or the
numbers
numbers okay between
310 okay
and 300 to 330 right
okay i will exclude the upper limit here
all right so these numbers are okay
let's check the numbers in the given
data right
so the first number
okay 310 the first number
okay 310 is repeated here
okay 320 is also there 319 are
also there
okay 318 is also there
okay and okay 316 is also there
all right so i will quickly you can note
down these numbers
so the first number is 310
okay second one is okay again 310 is
repeated
right so i will write it down twice
320
319
okay 318
okay and the last number is
316 all right
okay so
okay this total num okay totals are six
numbers right
that means
okay numbers of number
numbers of
number
okay between okay
310 to 330
which is equals to 6 okay
that's why okay frequency
for the given class frequency
for class interval 3
10 2 3 30
will be 6 all right
that means option
c is correct here
all right so that's all about today's
session if you have any doubt
please leave the comment below and
please subscribe to this channel so that
you will get
all the notification for upcoming videos
thanks for watching the video
bye
"
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