Basics of R

## [1] 773   3

##   data.srno workex gmat
## 1         1     21  720
## 2         2    107  640
## 3         3     57  740

##     data.srno workex gmat
## 771       771     28  610
## 772       772     10  610
## 773       773     52  620

## [1] "data.srno" "workex"    "gmat"

Summary Statistics

attach(mba)
mean(gmat)

## [1] 711.1643

median(gmat)

## [1] 710

x = summary(mba)
x

##    data.srno       workex           gmat      
##  Min.   :  1   Min.   :  9.0   Min.   :600.0  
##  1st Qu.:194   1st Qu.: 41.0   1st Qu.:690.0  
##  Median :387   Median : 52.0   Median :710.0  
##  Mean   :387   Mean   : 57.5   Mean   :711.2  
##  3rd Qu.:580   3rd Qu.: 69.0   3rd Qu.:730.0  
##  Max.   :773   Max.   :279.0   Max.   :780.0

sd(workex)

## [1] 27.38682

var(workex)

## [1] 750.0379

range(gmat)

## [1] 600 780

range <- max(gmat) - min(gmat)
range

## [1] 180

barplot(gmat)

#windows()
hist(workex)

library(moments)

## Warning: package 'moments' was built under R version 3.4.4

skewness(workex)

## [1] 2.603472

kurtosis(gmat)

## [1] 4.151876

boxplot(gmat,horizontal = T)

qqnorm(workex)

qqline(gmat)

pnorm(75,72,6) # pnorm(x,mean,sd)

## [1] 0.6914625