General Maths Puzzle Numerical Ability Number System

How to make the numbers 1,7,7,7,7 equal 100 using any math symbol without combining the numbers?

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General Other Question

In a long jump qualifying competition, the average jump length of successful competitors was 6.5 meters. The average jump length of unsuccessful competitors was 4.5 meter, and average jump length of all competitors was 4.9 meters. Find the percentage (in %) of successful competitors Find the wrong number in the following series.
15, 46, 63, 71, 75, 77, 78,.....