Hope some one can help me with this

Cheers ;)Quote:

Let X1,X2 .... X16 be a random sample from a normal distribution N(77,25).

Compute a)P(77<X<79.5)

b) P(74.2<X<78.4)

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- Apr 22nd 2006, 08:05 PMdarren_a1Normal Distribution
Hope some one can help me with this

Quote:

Let X1,X2 .... X16 be a random sample from a normal distribution N(77,25).

Compute a)P(77<X<79.5)

b) P(74.2<X<78.4)

- Apr 23rd 2006, 01:26 AMCaptainBlackQuote:

Let X1,X2 .... X16 be a random sample from a normal distribution N(77,25).

Compute a)P(77<X<79.5)

b) P(74.2<X<78.4)

RonL - Apr 23rd 2006, 07:24 AMdarren_a1
Yes -- it's actually X with a little line over the top- i didnt know how to put it in here.

Cheers - Apr 23rd 2006, 09:13 AMCaptainBlackQuote:

Let X1,X2 .... X16 be a random sample from a normal distribution N(77,25).

Compute a)P(77<X<79.5)

b) P(74.2<X<78.4)

has a normal distribution; .

So in this case the SD of the sample mean is so:

,

Which may be looked up in a suitable table:

.

The second question is:

Which from tables I make

RonL