Probability distribution
Can someone explain the answers to this
The mean weight of the 1000 men is 78 kg. The standard deviation (SD) is 9kg.
What weight did 2% of men in this sample weigh less than or equal to?
(Answer is 60kg idk how)
The mean weight of the 1000 men is 78 kg. The standard deviation (SD) is 9kg.
What weight did 2% of men in this sample weigh less than or equal to?
(Answer is 60kg idk how)
There’s a table:
Weight. Number of men
45.0 - 50.0 kg. 2
50.1 - 55.0 kg. 6
55.1 - 60.0 kg. 12
60.1 - 65.0 kg. 54
65.1 - 70.0 kg. 101
70.1 - 75.0 kg. 193
75.1 - 80.0 kg. 209
80.1 - 85.0 kg. 212
85.1 - 90.0 kg. 126
90.1 - 95.0 kg. 60
95.1 - 100.0 kg. 15
100.1 - 105.0 kg. 8
105.1 - 110.0 kg. 2
Total. 1000
I can’t use the calculator function from all maths, this is a question from this public health module i’m doing at uni.
Haven’t done maths in a while so i’m confused
Weight. Number of men
45.0 - 50.0 kg. 2
50.1 - 55.0 kg. 6
55.1 - 60.0 kg. 12
60.1 - 65.0 kg. 54
65.1 - 70.0 kg. 101
70.1 - 75.0 kg. 193
75.1 - 80.0 kg. 209
80.1 - 85.0 kg. 212
85.1 - 90.0 kg. 126
90.1 - 95.0 kg. 60
95.1 - 100.0 kg. 15
100.1 - 105.0 kg. 8
105.1 - 110.0 kg. 2
Total. 1000
I can’t use the calculator function from all maths, this is a question from this public health module i’m doing at uni.
Haven’t done maths in a while so i’m confused
Original post by chavvo
is there any more context to this question? I would normally (no pun intended) expect there to be an assumption about a normal distribution, then the question is about standardizing the distribution and finding where the standard score is <= 0.02
Forgot to add it doesn’t say anything about the distribution
Original post by confusedy13
Forgot to add it doesn’t say anything about the distribution
Original post by mqb2766
2% of 1000 is 20, so which weight corresponds to 20 people being less than it?
The answer is 60kg to the nearest whole number tho i just dont know the working out how to get there
Original post by confusedy13
The answer is 60kg to the nearest whole number tho i just dont know the working out how to get there
Original post by confusedy13
Forgot to add it doesn’t say anything about the distribution
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