The following are the number of books issued in a school library during a week:

105, 216, 322, 167, 273, 405 and 346.

Find the average number of books issued per day.

Find the arithmetic mean of

(i) the first eight natural numbers

(ii) the first ten odd numbers

(iii) the first five prime numbers

(iv) the first six even numbers

(v) the first seven multiples of 5

(vi) all the factors of 20

The number of children in 10 families of a locality are

2, 4, 3, 4, 2, 0, 3, 5, 1, 6.

Find the mean number of children per family.

The daily minimum temperature recorded (in degree F) at a place during a week was as under:

Find the mean temperature.

The percentage of marks obtained by 12 students of a class in mathematics are

64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, 1.

Find the mean percentage of marks.