Average. The first baseman doesn't do a lot of throwing just catching. For example if u played third base u have to through hard and fast. But even playing first it is good to have a good hard throw but as long as it isn't super slow!
75 mph
That depends on where the 1st baseman fields the ball. If the 1st baseman can field the ball, throw to second, and have enough time to get safely back to the base to catch the return throw, then (s)he will cover. If not, then it is the responsibility of the pitcher.
I believe he throws it back to the Pitcher.
When hit by right hand-ers (the majority of batters) it means the ball was pulled that direction and is going much faster. So the 3rd baseman must have fast reflexes. Also the 3rd baseman then has to make the throw to 1st base. This is a far throw and the 3rd baseman must have a strong accurate arm.
It depends on how experienced you are. If you have a long experience and have the right form, you should be hitting fast, hard line drives into the outfield giving you at least a single and at most a triple. If you aren't experienced you are probably stuck hitting slow ground balls directly to the 3rd baseman, 2nd baseman, or 1st baseman. Or you just strike out!
The pitcher. Also, the 1st baseman will stand on the mound to cut off a throw from the outfield to home plate.
Not completely sure of the question, but I'll go under the assumption the question being asked is: What is the official scoring when a ground ball is fielder by the 3rd baseman, and he then throws it to the 1st baseman for an out? The answer is: 5-3
If you're talking about the person who tags you to get you out is 1st baseman 2nd baseman and 3rd baseman.
Yes. The batter would be credited with an at bat and an RBI.
1st baseman (to the left and up and little), 2nd baseman (between 1st base and 2nd base), or right outfielder (to the left and back).
Joe Castle
Lets say there is a man on first base, and the batter gets an infield ground hit that is picked off by the shortstop. The shortstop throws the ball to the 2nd baseman who steps on 2nd base before the runner a at 1st can reach it. This is a force out as the 2nd baseman does not have to tag the incoming runner. If the shortstop caught the ball before the ball hit the ground and can throw the ball to the 1st baseman before the runner at 1st can get back and put his foot on the bag, then that would also would be a force out.