Question

The marks scored by five students in a test of mathematics carrying 100 marks are 50, 60,
50, 60 and 40. If a simple random sample of size 4 is drawn without replacement, draw up the
sampling distribution of sample mean. Hence, find the standard error of the sample mean.
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Answer 1

Step-by-step explanation:

If x

2

−2px+8p−15=0 has equal roots, then p equals

EASY

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ANSWER

let the root be α then

2α=2P⇒α=P.....(1)

and

α

2

=8P−15=8α−15

α

2

=3α−5α+15=0

⇒(α−3)(α−5)=0

α=3 or 5⇒P=3 or 5

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