Slide 5 of this PowerPoint Notes on Isotopes
http://www.austinisd.org/schools/staff.phtml?teacher=434&opt=handouts&cat=692
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You write 0.00007463 in scientific notation as: 7.463 × 10-5
we can write 56000 in word notation by fifty six thousand
the answer to how to write 87200 in scientific notation is 8.72*10^4
For elements with multiple natural isotopes the precise atomic mass could vary from place to place. Depending on the ratio of those isotopes. Living systems are a natural way isotopic concentration change in some elements. Lighter isotopes react faster and living systems will tend to concentrate them. Extraterrestrial sources of elements could have significantly different isotopic composition than Earth's. Nuclear decay could change some isotopes to different elements. Thus changing the isotopic ratios.
3.82 is the standard notation.