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Statistics 3 Goodness of fit help please?

Exam board: Edexcel
Exercise 4E.q. 9.

Question: A pesticide was tested by applying it in the form of a spray to 50 samples of 5 flies. The number of dead flies after 1 hour were then counted with the following results:

No. of dead flies: 0 1 2 3 4 5
Frequency: 1 1 5 11 24 8

a) Calculate the probability that a fly dies when sprayed.

b) Using a significance level of 5%, test to see if these data could be modelled by a binomial distribution.

Please give me a straight answer for part a at least! I tried to use p = total no. of successes/number of trials x N. But I got 132/(50 x 5) = 0.528 which is wrong :/

And in part b can you please help me form the binomial, like would it be B(50, (p from part a)) ?
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Original post by Dragonrage973
Exam board: Edexcel
Exercise 4E.q. 9.

Question: A pesticide was tested by applying it in the form of a spray to 50 samples of 5 flies. The number of dead flies after 1 hour were then counted with the following results:

No. of dead flies: 0 1 2 3 4 5
Frequency: 1 1 5 11 24 8

a) Calculate the probability that a fly dies when sprayed.

b) Using a significance level of 5%, test to see if these data could be modelled by a binomial distribution.

Please give me a straight answer for part a at least! I tried to use p = total no. of successes/number of trials x N. But I got 132/(50 x 5) = 0.528 which is wrong :/

And in part b can you please help me form the binomial, like would it be B(50, (p from part a)) ?


Where did 132 come from? I make the total number of dead flies 181
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Dragonrage973
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Original post by brianeverit
Where did 132 come from? I make the total number of dead flies 181


Yeah no my bad 181 it was late and my calculator was out of reach lol.
You submit it at tutorteddy ...they help for free

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