1000 students have written an examination the
test is 35 & standard deviation is 5.assume the distribution to be normal, find how many
students marks lies blo 25 & 40?
How many
Students marks
Assumin
6) How
il How many
Students
get below 20?
students get more than 50 ?
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Answer:
The mean score of 1000 students for an examination is 34 and standard deviation is 16.
(i) How many candidates can be expected to obtain marks between 30 and 60 assuming the normality of the distribution and
(ii) Determine the limits of the marks of the central 70% of the candidates
{P[0<z<0.25]=0.0987;P[0<z<1.63]=0.4484;P[0<z<1.04]=0.35}
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