Mickey's beagle has a mass of 15 kg his – one has a mass of 13 kg what is the combined mass of the two dogs

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Find two numbers if their sum is 91 and the ratio is 6: 7?

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.