Answer:
0.128 ; 0.872 ; 0.748 ; 0.124 ; 0.252
Step-by-step explanation:
Given the data above ;
The frequency distribution generated for the number of defects observed on each of 250 lcd screens are as follows :
__number of defects___frequency
____0 _______________24
____1 _______________82
____2 _______________38
____3 _______________43
____4 _______________31
____5 _______________26
____6 _______________6
A.) . What proportion of the screens have more than 4 defects? Give your answer to three decimal places.
More than 4 defects = (number of 5 defects + 6 defects) / total number of defects)
(26 + 6) / 250 = 32 / 250 = 0.128
b. What propotion of the screens have at most 4 defects? Give your answer to three decimal places.
Number of (0 + 1 + 2 + 3 + 4) defects
= (24 + 82 + 38 + 43 + 31) / 250
= 218 / 250 = 0.872
c. What proportion of the screens have fewer than 4 defects? Give your answer to three decimal places.
Number of (0 + 1 + 2 + 3) defects
= (24 + 82 + 38 + 43) / 250
= 187 / 250 = 0.748
d. What proportion of the screens have exactly 4 defects? Give your answer to three decimal places.
Number of 4 defects = 31
= 31 / 250
= 0.124
e. What proportion of the screens have at least 4 defects? Give your answer to three decimal places.
Number of (4 + 5 + 6) defects
= (31 + 26 + 6) / 250
= 63 / 250
= 0.252
