3. The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with a mean of 6.7 minutes and a standard deviation of 2.2 minutes. For a door selected at random, what is the probability the assembly time will be: A: 5 minutes or less B: 10 minutes or more C: between 5 and 10 minutes Please explain

Question

3. The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with a mean of 6.7 minutes and a standard deviation of 2.2 minutes. For a door selected at random, what is the probability the assembly time will be:   A: 5 minutes or less   B: 10 minutes or more  C: between 5 and 10 minutes   Please explain

amistre64 · Answer

you are looking to find a cumulative value

amistre64 · Answer

|dw:1385042122493:dw|

amistre64 · Answer

you need to either define the zscore for the 5 and 10 values and find their respective areas from a table.  Or you can use a ti83 or similar with a normalCDF function:

normCDF(low, high, mean, sd)