Question

The heights (in cm) of 20 students were recorded as under:

128 142 148 126 131 136 128 133 132 129

133 134 138 135 134 136 137 139 143 138

Prepare a grouped frequency distribution table with intervals as 125-130, 130-135 and so on. Plz answer fast

Answer 1

Answer:

Destroys life in the water based ecosystem which is polluted which in turn disrupts natural food chain. Aquatic life is destroyed due to the non-biodegradable pesticides and chemicals. Water pollution affects the microbial population. There is a steep increase in the BOD levels of water.

Step-by-step explanation:

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Answer 2

Answer:

Minimum height =131cm

Maximum height =156cm

Range =156−131=25

Number of classes =4

Class range =425=6.25 approx 6

class 1=131+6=137

class 2=137+6=143

class 3=143+6=149

class 4=149+6155

class 5=155+6=161

Class interval                     Frequency

131−137                              9

137−143                              3

143−149                              2

149−155                              4

155−161                              2

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