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algol13
3 years ago
15

Somoene please help!I am struggling a lot!!

Mathematics
1 answer:
baherus [9]3 years ago
5 0

Answer:

Step-by-step explanation:

height(h)    mid value    frequency

in cm                 x                 f                   xf

120<t≤124         122              7                  854

124<t≤128         126              8                 1008

128<t≤132         130             13                 1690

132<t≤136         134              9                 1206

136<t≤140         138              3                   414

          total                          40               5172

mean height=5172÷40=129.30

mean height=129.30 cm

b.

it is an estimate i have taken only mid value,for example in the interval all the 7 students may be of length greater than 122 and viceverse.

Similarly for other intervals.

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In a bag of apples, the ratio of red apples to green apples is 3:4, so we must first realise that there is a total of 7 parts.

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