mean = df['SalaryUSD'].mean()
print(mean)
sd =2*df['SalaryUSD'].std()
print(sd)
outlier_limit=mean-sd
print(outlier_limit)
outlier_limit2=mean+sd
type(df['SalaryUSD'])
df['outliers']=df[('SalaryUSD' > outlier_limit)|('SalaryUSD' < outlier_limit2)]