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Short Answer 0.8
Remark
The total number of possible draws is
3 Blue + 2 Red + 5 silver = 10
There are two ways of solving this, both of which will be used later on.
Method 1
If you don't draw a read paper clip, that means you will draw a silver or blue paper clip.
Method Two
The other way is to draw a red one and take that probability away from 1.
P(red) =
1 - 0.2 = 0.8 Same answer.
Remark
The total number of possible draws is
3 Blue + 2 Red + 5 silver = 10
There are two ways of solving this, both of which will be used later on.
Method 1
If you don't draw a read paper clip, that means you will draw a silver or blue paper clip.
Method Two
The other way is to draw a red one and take that probability away from 1.
P(red) =
1 - 0.2 = 0.8 Same answer.
Answer:
68.26% of the parts will have lengths between 3.8 in. and 4.2 in.
Step-by-step explanation:
The lengths of a lawn mower part are approximately normally distributed
Standard deviation =
We are supposed to find What percentage of the parts will have lengths between 3.8 in. and 4.2 in . i.e. P(3.8<x<4.2)
Formula :
At x = 3.8
Z=-1
Refer the z table for p value
p value =0.1587
At x =4.2
Z=1
Refer the z table for p value
p value =0.8413
P(3.8<x<4.2)=P(x<4.2)-P(x<3.8)=0.8413-0.1587=0.6826
So, 68.26% of the parts will have lengths between 3.8 in. and 4.2 in.