Recall:

- In addition and subtraction → the answer carries the number of decimal places with the as the quantity with the lowest number.
- In multiplication and division → the answer carries the number of significant figures as the factor with the fewest decimal place

Millikan determined the charge on the electron by studying the static charges on oil drops falling in an electric field. A student carried out this experiment using several oil drops for her measurements and calculated the charges on the drops. She obtained the following data:

Droplet | Calculated Charge (C) |

A | 1.60 x 10^{–}^{19} |

B | 3.15 x 10^{–}^{19} |

C | 4.81 x 10^{–}^{19} |

D | 6.31 x 10^{–}^{19} |

How many significant figures should she report for the value of the electronic charge?

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