A grain of rice average weight is about 25 milligrams or 0.025 grams. Which of the following shows the weight in grams in scientific notation?
[tex]2.5x {10}^{2} [/tex]
[tex]2.5x {10}^{ - 2} [/tex]
[tex]0.25x {10}^{1} [/tex]
[tex]0.25x {10}^{ - 1} [/tex]
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