If the probability of a person being left handed is .11, then the probability of a person being right handed is .89 (1.00 - .11). In a class of 40 people, there are 40! (40 factorial) = 40 x 39 x 38 x .... x 3 x 2 x 1 possible Permutations of students. Within this number, there are many that will yield exactly 5 left handed people. 40-P-5 is the number of Permutations of 5 within a class of 40 (sorry, can't use the correct formating here!): = 40! / (40 - 5) ! = 40! / 35! = 40 x 39 x 38 x 37 x 36 Since we don't care about order..... we need to factor out the number of identical permutations. 40-C-5 = 40-P-5 / 5! So.... (40 x 39 x 38 x 37 x 36) / (5 x 4 x 3 x 2 x 1) = 658,008 Now, what is the probability of any one such combination? (.89 to the power 35) x (.11 to the power 5) = 0.000000273 So the probability of exactly 5 left handed people in the class is 658,008 x .000000273 = 17.9408137 %
no
in a survey a few years ago it said on average left handers die 7-9 years before right handers
There is no patron saint of left handers.
There is no link between hand preference and intelligence.
International Left-Handers Day is August 13.
Yes, some makers do make firearms for left handers. Remington comes to mind.
Yes, on the 13th August.(Well, there is in the UK anyway where about 2,500,000 left handers gather)
Left-handers do not necessarily need a left-handed guitar to play effectively. Many left-handed guitarists play right-handed guitars by simply restringing them or playing them upside down. It ultimately depends on the individual's comfort and preference.
No.
Not as such. But there are some tools(like scissors) which has to be used by the (wrong) right hand, which might make them clumsier in some cases. Our style of writing is also adapted for right handed, so lefties have that harder by definition too.
well, they are the same as right handed peoples aren't they just write with different hands! It depends on what you get into though.
Field hockey