Please refer to the following table:

Question

Number of Cellular Phones  in Household:

DECILE
1 - 1.00
2 - 1.00
3 - 1.00
4 - 1.00
5 - 2.00
6 - 2.00
7 - 3.00
8 - 3.00
9 - 4.00

(a) How many cellular phones does a household have at the 42nd percentile? 
(b) How many cellular phones does a household have at the 3rd quartile? 
(c)90 percent of respondents have ______ cellular phones or fewer.