How many significant figures does 3.0050 have?

5 significant figures
1. never count zeros in front of the decimal
2. always count non zeros and zeros in between of two non zeros.
3. count the trailing zeros if there is a decimal
for example:
300 has 1 significant figures
0.70005 has 5 significant figures
0.880 has 3 significant figures
Keep practice and you should master it
Hope this help