a) In year 1978, the temperature was,
Multiplying both numerator and denominator by, we get
As we know that, to divide a decimal number by 10, 100 or 1000, we shift the decimal point in the number to the left by as many places as there are zeroes over 1, to get the quotient.
So, the temperature in year 1978 was 0.02° C.
Order of five years from coldest to warmest is:
1964 < 1965 < 1978 < 1958 < 2002
b) Since the temperature in 1946 was -0.03° C
Therefore, it lies between the year 1965 and 1978
-0.10 < -0.03 < 0.02
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