To find how many times more electricity was used in 1950 compared to 1902, you divide the consumption in 1950 by the consumption in 1902.
Consumption in 1902: \[ 6.03 \times 10^9 , \text{kWh} \]
Consumption in 1950: \[ 4.3 \times 10^{11} , \text{kWh} \]
Now, we perform the division:
\[ \frac{4.3 \times 10^{11}}{6.03 \times 10^9} \]
First, divide the coefficients:
\[ \frac{4.3}{6.03} \approx 0.712 \]
Next, subtract the powers:
\[ 10^{11 - 9} = 10^2 \]
Combine the results:
\[ 0.712 \times 10^2 \]
To express this in proper scientific notation, we need to adjust \(0.712\):
\[ 0.712 = 7.12 \times 10^{-1} \]
So we can rewrite our result as:
\[ 7.12 \times 10^{-1} \times 10^2 = 7.12 \times 10^{1} \]
Thus, the final answer in scientific notation is:
\[ \boxed{7.12 \times 10^1} \]
This can be rounded to \( 7.13 \times 10^1 \) if necessary, depending on the required precision. In this case, the first response option is the closest to our calculation.
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