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If the income of 1000 families in a city follows a normal distribution of an average...

If the income of 1000 families in a city follows a normal distribution of an average of 1,800 riyals, then the standard deviation is 300
1- The probability of a family's income exceeding 2,400 riyals
2- The probability of family income greater than 1500 riyals
3- The probability of family income is less than 2550 riyals
3- The family income probability is 1200 riyals
Math   Statistics-And-Probability   
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