What is the number in the missing box and how do I calculate it in excel? Thank you

A B C D E F G H 51. A random number generator picks a number from one to nine in a uniform manner. 3 1. X ~ (1 , 9 ) 4 3. f (x ) = fx=1/(9-1) 0.125 5 4. H = H=(9+1)/2 5 5.0 = o=sqrt((9-1)^2/12) 2.3094 6. P (3.5 5.67) = 0.41625 9 8. P (X > 5/ x > 3) = 10 9. Find the 90th percentile. (k-1)*1/8=0.9 k-1=0.9*8= 7.2 11 k=7.2+1 8.2