Solution-A:
with pnormGC in R we can get the required answer:
Rcode
library(tigerstats)
pnormGC(bound = 24,region="below",mean=26.6 ,sd=4.7,graph=TRUE)
0.2901
Solution-b;
library(tigerstats)
pnormGC(bound = 32,region="above",mean=26.6 ,sd=4.7,graph=TRUE)
0.1253
Solution-c:
library(tigerstats)
pnormGC(bound=c(25,30),region="between",mean=26.6,sd=
4.7,graph=TRUE)
answer;
0.3985
Solution-d:
library(tigerstats)
qnormGC( 0.20,region="above",mean=26.6,sd=4.7,graph=TRUE)
30.56
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