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    Choose the right answer

    An alien wants to estimate the percentage of brown cows on earth.

    Does it need to count every cow?

    hint
    Hint: A small random group can represent the whole population.

    Choose the right answer

    In a sample of 100 cows,
    30 are brown.
    If there are 10 million cows on Earth,
    estimate how many are brown

    hint
    Hint: Look at the sample first, turn it into a percentage, then apply it to the total.