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electricity help watch

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    i was given a sheet which stated that the charge of an electron is -1.6x10^-19 but after looking it up on the internet it seems wrong (might be a typo in the sheet).

    However, one of the questions I found in my homework said (basically):
    "a polythene rod is charged by rubbing and is stroked several times across a metal cap used to measure charge. the initial reading was 0. after 3.8s the final reading was -6.4 x10^-8C. calculate the number of electrons transferred."

    how can the charge be negative? is it another typo? or is the sheet correct? also would i just divide the charge given by "e"?
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    The charge of an electron is indeed: -1.6x10^-19.
 
 
 
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