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- May 3, 2021 at 12:06 pm #619531
In a normal distribution with a mean of 240, 34% of the population lies between 220 and 260.

The standard deviation of the distribution is?Could you please advise for the below?

May 3, 2021 at 8:06 pm #619590I think ,I found the answer but please advise if my concern is right.

Thank you in advance.

As mean is 240 and 34% lies between 220 & 260 ,the standard deviation will be between 240 & 260 ,that means at the half of 34% ,so 17% .

260-240/? =17% and from the table 0.44 so 260-240/?=0,44=20/0.44=?=45.45May 8, 2021 at 9:38 pm #620091In a normal distribution with a mean of 240, 34% of the population lies between 220 and 260.

The standard deviation of the distribution is?As mean is 240 and 34% lies between 220 & 260 ,the standard deviation will be between 240 & 260 ,that means at the half of 34% ,so 17% .

260-240/s =17% and from the table 0.44 so 260-240/s=0,44=20/0.44=s=45.45Could you please advise if the answer is correct?

where s=standard deviationJune 2, 2021 at 2:04 pm #622779Hi Rania,

Sorry for the delay – I missed this post.Yes your workings are correct

s= 45.45

perfect

Thanks

Cath - AuthorPosts

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