SOLUTION: 2. Find the standard deviation and coefficient of skewness for the following distribution Variable 0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 Frequency 2 5 7 13 21 16 8 3 3

Question 782759: 2. Find the standard deviation and coefficient of skewness for the following distribution
Variable 0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40
Frequency 2 5 7 13 21 16 8 3
3. A salesman has a 60% chance of making a sale to any one customer. The behaviour of successive customers is independent. If two customers A and B enter, what is the probability that the salesman will make a sale to A or B.
4. To verify whether a course in Research Methodology improved performance, a similar test was given to 12 participants before and after the course. The original marks and after the course marks are given below:
Original Marks 44 40 61 52 32 44 70 41 67 72 53 72
Marks after the course 53 38 69 57 46 39 73 48 73 74 60 78
Was the course useful? Consider these 12 participants as a sample from a population.

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
3. A salesman has a 60% chance of making a sale to any one customer. The behaviour of successive customers is independent. If two customers A and B enter, what is the probability that the salesman will make a sale to A or B.
.
.6*.6=.36 probability the salesman will make a sale to both of them. .6-.36=0.24 the probability he will make a sale to only the first one of them he meets. .24 the probability he makes a sale only the second one he meets.
.36+.24+.24=0.84 the probability that the salesman will make a sale to A or B.
Drawing an Venn diagram of the situation will clarify things.
.
Ed
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