grouped frequency distribution below which depicts the mass (in kilograms) of 25 puppies and dogs at a pet store Mass (kg) Number of dogs f cf midpoint 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? The standard deviation (in kg) is closest to?

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