3 years ago

Statistical measures

2 answers:

8 0

The median is the middle record of data when it is ordered

and in case of even data number, median will be the mean of the two middle records

firstly we need to arrange them:
29.9
30
30.1
30.5
30.7
30.8
31
31

the 4th and 5th records are the median,,,,,
and their mean = 30.5+30.7 = 30.6

This is the median of the data sete

Hope that helps

Amanda [17]3 years ago

3 0

29.9, 30.0,30.1,30.5,30.7,30.08,31.0,31.0
the number of data is 8 elements so the medium will be the 3rd and 4th number
so the medium is 30.5 and 30.7

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3.1 Factorise completely<br><br>3.1.2 3x2 - 2x - 8

Ugo [173]

Answer:

3x² – 2x – 8

=> 3x² – 6x + 4x – 8

=> 3x( x – 2 ) + 4( x – 2 )

=> ( 3x + 4 ) ( x – 2 )

Therefore,

Either, 3x + 4 = 0

3x = - 4

x = - 4/3 (Ans)