71. Find the probability that in a family of 4 children there will be at least one boy. Assume that the probability of a male birth is $$\frac{1}{2}$$.
72. . . . . . . . . errors are made when we accept a null hypothesis which is not true.
73. . . . . . . . . is a process of transporting the data from one location to the other
74. Six dice are thrown 729 times. How many times do you expect the dice to show five or six?
75. You are given the following information about advertising expenditure and sales.
Advertisement (X)
Sales (Y) (Rs. in lakh)
Arithmetic Mean
10
90
Standard Deviation
3
12
Correlation coefficient between advertising expenditure and sales 0.80. What is the likely sales for advertising budget of Rs. 15 lakh?
| Advertisement (X) | Sales (Y) (Rs. in lakh) | |
| Arithmetic Mean | 10 | 90 |
| Standard Deviation | 3 | 12 |
76. From a well shuffled pack of 52 cards a card is selected at random. Find the probability that it is a black coloured card
77. In a negatively skewed distribution,
78. Management information system plan includes
79. In two large populations there are 35 and 30 per cent of fair haired people. Will the differ ence disappear at 5% level of significance, if samples of 1500 and 1000 are respectively taken from the two populations?
80. Given, N = 15, $$\overline {\text{X}} $$ = 25, $$\overline {\text{Y}} $$ = 18, $$\sum $$d2x = 136, $$\sum $$d2y = 138, $$\sum $$dxdy = 122. Calculate the correlation coefficient.
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