For a frequency distribution of a discrete variable, the diagram of less than type cumulative frequency is a
It is known from past experience that in a certain plant there are on the average 4 industrial accidents per month. The probability that in a given month there will be less than 4 accidents is : (e4= 0.0183)
For a frequency distribution of a variable x, mean = 32, median = 30. The distribution is :
Let x be a random variable with probability mass function
ƒ(x) = k, |x|, if x = -2, 1, 3
=0, otherwise
where, K is a constant. Then the variance of x is :
If L(p) and L(q) represent Laspeyres' index number for prices and quantities and P(p) and P(q) represents Paasche's index number for price and quantities then :
Initially there are 9 workers, all being paid a uniform wage. Later a 10th worker is added whose wage rate is Rs 20 less than for the others. The average wage gets :