the grouped frequency distribution below which depicts the mass (in kilograms) of 25 puppies and dogs at a pet store. Mass (kg) no of dogs (f) cf m  fm fm2 0>2 3 3 1 3 3 2>4 6 9 3 18 54 4>6 10 19 5 50 250 6>8 4 23 7 28 196 8>10 2 25 9 18 162 a puppy is  regarded as having a mass under 2 kg. What is the percentage of puppies in this sample? what is the standard deviation (in kg)

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