GWD27-14

meckychen

Q14:

The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively.  If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?





I.                    3

II.                 7

III.               12





A.    I only

B.    II only

C.    III only

D.    I and III only

E.    I, II, and III

Answer is D

How to calculate? Thanks

jackraywen

The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively.  If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?
4＋6＋7＋9＋10＝36
1）3的情况，总数39， median＝（6＋7）／2＝6。5，average＝39／6＝6。5
2）7的情况，总数41，median＝7，average＝41／6＝6。8。。。。
3）12的情况，总数48，median＝（7＋9）／2＝8，average＝48／6＝8

vegachang

同問

meckychen

up

meckychen

Can anyone help me?