I estimate 20000 because 19724 is closer to 20000 than it is to 10000
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By one estimation, several hundred gallons of oil leaked into the lake. Estimation can often provide an approximate number, rather than an exact number.
No. If the rays do not meet, there is no angle.
Significant figures communicate how carefully a measurement is made. You could round it
The answer will depend on what the comparison is to be made with and also on how "better" is being judged. The arithmetic average is the best linear unbiased estimate as well as the maximum likelihood estimate of the centre. The best estimate for the spread depends on whether the data comprise the population or a sample from the population.
To estimate the quotient, we first round off the divisor and the dividend to the nearest tens, hundreds, or thousands and then divide the rounded numbers. In a division sum, when the divisor is made up of 2 digits or more than 2 digits, it helps if we first estimate the quotient and then try to find the actual number.