# Ahly

Members

5

0 Unknown

• Gender
Male
• Exams
May 2017
• Country
Egypt
1. ## Mathematics IA - Help

Hi, For my IA I settled on constructing an equation that attempts to model the exponential growth/decay of "something". I would then use line of best fit etc. to make it more accurate. Finally, I would use a 'standard formula' and compare accuracies. Do you have any ideas for things that could be modeled? I figured the population of Egypt but it looks more linear than exponential. I would also like something that has a formula other than the standard exponential formula of P=Ce^t. I should note that I was inspired to do this by a sample IA posted by the IB on the cooling of tea. The three methods as well are taken from the IA. (P.s. Would that be plagiarism? I will make sure no figures/formulas are the same. I would just like to mimic how the student went about answering the problem).
2. ## The Hat Check Problem!

Hi, for my IA I was thinking of doing the hat check problem. Essentially it goes like this; group of men walk into a restaurant checking in n number of hats at the door. The restaurant mixes the the hats up and as the evening is over, each man is randomly given a hat from the pile. What is the probability that no person gets their hat back? Suprisingly, the answer is 1/e. I am a math Sl student. I figured HL/further math students would likely recognize the problem. If anyone is familiar with the problem could you please elaborate on whether this is SL level or above. I have found some explanations rather complicated and wondered whether it was ultimately worth it given the amount of energy it would require with mocks coming up. I know I would be able to get my head around it, but have begun to doubt whether the return (in terms of marks) for this question would be worth it. I have time to change my topic so I am not particularly worried.
3. ## Hat Check Problem - IA

Hi, for my IA I was thinking of doing the hat check problem. Essentially it goes like this; group of men walk into a restaurant checking in n number of hats at the door. The restaurant mixes the the hats up and as the evening is over, each man is randomly given a hat from the pile. What is the probability that no person gets their hat back? Suprisingly, the answer is 1/e. If anyone is familiar with the problem could you please elaborate on whether this is SL level or above. I have found some explanations rather complicated and wondered whether it was ultimately worth it given the amount of energy it would require with mocks coming up. I know I would be able to get my head around it, but have begun to doubt whether the return (in terms of marks) for this question would be worth it. I have time to change my topic so I am not particularly worried.