Manufacturing and product development a a typical washing machine has several different cycles, including soak, wash, and rinse. the energy consumption of a washing machine is linked to the length of each cycle. a random sample of 21 washing machines was obtained, and the length (in minutes) of each wash cycle was recorded. the summary statistics are x 37.8 and cycle times is normal. a. find a 90% confidence interval for the true mean wash cycle time. write a solution trail for this problem

Explained

Step-by-step explanation:

here std error =std deviation/(n)^1/2 =1.2875

for 90% CI; at 21 degree of freedom =1.7247

hence confidence interval =mean +/- t*std error =35.579 ; 40.021

b) this interval gives 90% probability to contain true mean of population of wash cycle time

c)that interval would be wider as value of t will be greater for larger interval

details

step-by-step explanation:

10.416 meters per second

step-by-step explanation:

distance=1 00 meters

time= 9.6 seconds in decimal form or 9 3/5 as a mixed number

average speed= 100/9.6

=10.416 meters per second or 10 52/125 as a mixed number.