3. A Simple Random Sample of 20 postal employees found that the average amount of time these employees had
worked for the U. S. Postal Service was 7 years
with a standard deviation of 2 years. Construct and interpret a 95% confidence interval for the mean years of service of all postal employees

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

25.3

step-by-step explanation:

1st step

add 3+6

=9

multipy 9*3

=37