The torque required to remove bolts in a steel plate is rated as very high, high, average,

and low, and these occur about 30%, 40%, 20%, and 10% of the time, respectively.

Suppose

bolts are rated; what is the probability of rating 7 very high, 8 high, 6

average, and 4 low? Assume independence of the 25 trials. n=25