A student makes measurements from which she calculates the speed of sound as $327.66 m s^{–1}$. She estimates that her result is accurate to ±3 %. Which of the following gives her result expressed to the appropriate number of significant figures?
1 )
$327.7 m s^{–1}$
2 )
$328 m s^{–1}$
$330 m s^{–1}$
4 )
$300 m s^{–1}$
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