Statistics revision

**skhalid** · 06-19-2007

to help us with our statistics paper I thought I should make up questions and for those who want to revise...you can answer them.

One question at a time, first topic will be probability.

In my handbag I have 2 toffees, 5 mars bars, 8 cherry drops and 11 sticks of chewing gum.

What is the probability that I pick a cherry drop when I dip my hand inside my handbag? Simplify where possible.

note* I already know the answer to this question so whoever gets it right will be notified as soon as possible and another question will be asked)

**baby_muslimah** · 06-19-2007

8/26 = 4/13

i bet that's wrong!

**skhalid** · 06-19-2007

Originally Posted by baby_muslimah

8/26 = 4/13

i bet that's wrong!

that is correct..now for a harder question ...extended from the previous question.

I ate my cherry drop (not replacing it) I went through my handbag again and picked a mars bar but I don't like it (so I decided to replace it) what is the probability of picking a mars bar for the second time?

note* i hope i haven't confused anyone, if I have please let me know and I'l re-phrase the question, although I am nice in the real thing you will not be able to change the question not even with a magic wand lol

**baby_muslimah** · 06-19-2007

well ur down to 25 now, and theres 5 mars bars so that = 5/25 = 1/5?

**baby_muslimah** · 06-19-2007

I'm in year 9 now, haven't done statistics, I think I HAVE to do it for GCSE

**skhalid** · 06-19-2007

Originally Posted by baby_muslimah

well ur down to 25 now, and theres 5 mars bars so that = 5/25 = 1/5?

good now lets make it extra harder...

I put both of my hands in my handbag...(hint*this is an 'and' question)
what is the probability of picking a stick of chewing gum and a toffee?

(I promise this is the last probability question, the next topic is averages, i.e finding the mean, median, lower quartile, upper quartile, interquartile range etc)

**------** · 06-19-2007

I did Statistics at AS Level in college....got an A, Alhamdulillaah

- It was so much easier than maths!!

**baby_muslimah** · 06-19-2007

Originally Posted by skhalid

good now lets make it extra harder...

I put both of my hands in my handbag...(hint*this is an 'and' question)
what is the probability of picking a stick of chewing gum and a toffee?

(I promise this is the last probability question, the next topic is averages, i.e finding the mean, median, lower quartile, upper quartile, interquartile range etc)

13/26?

That is a hard one lol

**skhalid** · 06-19-2007

Originally Posted by baby_muslimah

13/26?

That is a hard one lol

that is incorrect, remember I took a cherry drop out......

**baby_muslimah** · 06-19-2007

Ohh yeah, forgot about that. 13/25?

**skhalid** · 06-19-2007

Originally Posted by baby_muslimah

Ohh yeah, forgot about that. 13/25?

great..now I can move on

Here is a list of numbers.
1,2,3,4,4,6,7,8,9,11 (I have ordered them for you, ent I the best? lol)

1a) Find the mean
b) Find the mode
c) Find the median
d) Find the upper quartile
e) Find the lower quartile
f) Find inter-quartile range

Note* the next question will extend on this to find outliers using the answer you find for this set of questions. *and that will be all for today...you can chill now you deserve it

**The Ruler** · 06-20-2007

a) mean = 5.5
b) mode = 4
c) median = 5
d) UQ = 8
e) LQ = 3
f) IQ = 5

Outliers = 1.5 x 5 = 2.5
8 + 2.5 = 10.5
3 - 2.5 = 0.5

Thus, 11 is an outlier.

Next question: tell me about normal curve and why/why not this data would be relevant to a normal curve.

**skhalid** · 06-20-2007

Originally Posted by Amatul Malik

a) mean = 5.5
b) mode = 4
c) median = 5
d) UQ = 8
e) LQ = 3
f) IQ = 5

Outliers = 1.5 x 5 = 2.5
8 + 2.5 = 10.5
3 - 2.5 = 0.5

Thus, 11 is an outlier.

Next question: tell me about normal curve and why/why not this data would be relevant to a normal curve.

Well done bro...I'll get back to you