Question

53. The length of 40 leaves of a plant are measured correct to the nearest
millimetre, and the data obtained is represented below.
Length
118-126
127-135
136-144
145-153
154-162
163-171
172-180
No. Of
3
5
9
Х
5
4
2
Leaves
M= 146: 75​

Answer 1

Answer:

I know this question is of maths not chemistry

• please mark me as brainlist. Bahut mahainat sai kiya hai

Explanation:

CI Frequency c.f

117.5−126.5 3 3

126.5−135.5 5 8

135.5−144.5 9 17

144.5−153.5 12 29

153.5−162.5 5 34

162.5−171.5 4 38

171.5−180.5 2 40

N=40

2

N

=

2

40

=20

∴ Median class =144.5−153.5

⇒ l=144.5,c.f=17,f=12 and h=9

⇒ Median=l+

f

2

N

−c.f

×h

=144.5+

12

20−17

×9

=144.5+

12

3

×9

=144.5+2.25

=146.75