Katrina has a collection pebbles. The ratio of pink pebbles to brown pebbles is 5:18. The ratio of brown pebbles to grey pebbles is 6:2. Work out the ratio of pink to brown to grey pebbles. Give your answer in its simplest form.
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Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?