Normal dist help
If X has the distribution N(4, 16), find
(a) the number a such that P(|X − 4| ≤ a) = 0.95
(c) the 90th percentile,
(d) the interquartile range
(a) the number a such that P(|X − 4| ≤ a) = 0.95
(c) the 90th percentile,
(d) the interquartile range
how would i do these questions without tables
Original post by 12345username
how would i do these questions without tables
Does the question say you can't use tables?
Yeah basically
Original post by mqb2766
Does the question say you can't use tables?
Original post by 12345username
Yeah basically
Really? You won't get a very accurate answer as you'd effectively have to remember key values.
Do you have a photo of the question?
Original post by 12345username
If X has the distribution N(4, 16), find
(a) the number a such that P(|X − 4| ≤ a) = 0.95
(c) the 90th percentile,
(d) the interquartile range
(a) the number a such that P(|X − 4| ≤ a) = 0.95
(c) the 90th percentile,
(d) the interquartile range
Hi, I've moved this to the Maths study help forum - it's usually a better place to get help with academic questions than the Mathematics University Course forum
Original post by mqb2766
Really? You won't get a very accurate answer as you'd effectively have to remember key values.
Ah but they've doubtless had it drummed into them that 95% of a normal distribution is within two standard deviations of the mean. Of course this information is not useful if you're unable to back out what range of values corresponds to this.
Original post by SerBronn
Ah but they've doubtless had it drummed into them that 95% of a normal distribution is within two standard deviations of the mean. Of course this information is not useful if you're unable to back out what range of values corresponds to this.
Agreed, or 1.96 std devs or whatever the significant figures are ...
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