If the mean of 7 observations is 43 and each observation is increased by 7, then what will be the new mean?

1. 36

2. 43

3. 44

4. 50

While computing the mean of grouped data, we assume that the frequencies are :

1. evenly distributed over all the classes

2. centred at the class marks of the classes

3. centred at the upper limits of the classes

4. centred at the lower limits of the classes

The mean of five consecutive odd numbers A, B, C, D and E in ascending order is 37. What is the product of B and D?

1. 1365

2. 1585

3. 1935

4. 2035

The mean of 5 consecutive odd numbers of set A is 37. What will be the average of set B containing four consecutive even numbers if the smallest number of set B is 13 more than the greatest number of set A?

1. 53

2. 55

3. 57

4. 59