Answer:
P = 0.006
Step-by-step explanation:
Given 
n = 25 Lamps 
each with mean lifetime of 50 hours and standard deviation (SD) of 4 hours
Find probability that the lamp will be burning at end of 1300 hours period.
As we are not given that exact lamp, it means we have to find the probability where any of the lamp burning at the end of 1300 hours, So we have 
Suppose i represents lamps
P (∑i from 1 to 25 ( > 1300)) = 1300
 > 1300)) = 1300 
= P( >
>  )                  where
)                  where  represents mean time of a single lamp
 represents mean time of a single lamp
= P (Z>  )                Z is the standard normal distribution which can be found by using the formula
)                Z is the standard normal distribution which can be found by using the formula 
Z = Mean Time ( ) - Life time of each Lamp (50 hours)/ (SD/
) - Life time of each Lamp (50 hours)/ (SD/ )
)
Z = (52-50)/(4/ ) = 2.5
) = 2.5
Now, P(Z>2.5) = 0.006 using the standard normal distribution table
Probability that a lamp will be burning at the end of 1300 hours period is 0.006
 
        
             
        
        
        
You have a 1/2 chance of spinning an even number on the spinner, and a 1/2 chance of rolling an odd number on the die, 1/2 times 1/2 give you a 1/4 chance of doing both of those tasks.
        
                    
             
        
        
        
Answer:
Jane is 52 7/40 inches tall
Step-by-step explanation:
What you do is you subtract 1 3/8 from 54 3/4 which gives you Carl's height, which is 53 3/8.
Lastly, you subtract 1 1/5 from 53 3/8 which is 52 7/40.
 
        
                    
             
        
        
        
C is your answer. Because 8 times 1.75$ = $14.00 and 5 times 1.25= $6.25. So $14.00+ $6.25 = $20.25