20% of bolts produced by machine are defective. The mean and standard deviation of defective bolts in total of 900bolts are respectively
Answers
Answered by
1
- Mean = 180
- Standard Deviation = 12
Given :
- 20% of bolts produced by machine are defective
- Total number of bolts = 900
To find :
- Mean
- Standard Deviation
Solution :
Step 1 of 3 :
Find probability of producing a defective bulb
Here it is given that 20% of bolts produced by machine are defective
Hence probability of producing a defective bulb
= p
Step 2 of 3 :
Find the mean
Total number of bolts = n = 900
Mean
= np
Step 3 of 3 :
Find Standard Deviation
Standard Deviation
Similar questions
Geography,
2 months ago
Science,
2 months ago
World Languages,
5 months ago
Math,
9 months ago
Social Sciences,
9 months ago