please tell me what im doing wrong here, I think my standard deviation is off but I got part a wrong somehow. did I input something wrong?

Rich Cole Control Devices, Inc., produces custom-built relay devices for auto makers. The most recent project undertaken by Cole requires 14 different activities. Cole's man- agers would like to determine the total project completion time (in days) and those activities that lie along the critical path. The appropriate data are shown in the following table. a) What is the probability of being done in 53 days? b) What date results in a 99% probability of completion? MOST IMMEDIATE OPTIMISTIC LIKELY PESSIMISTIC ACTIVITY PREDECESSOR(S) TIME TIME TIME 4 6 7 B 1 3 N 3 A 6 6 6 D A 5 00 8 11 E B, C 1 9 18 F D N 2 3 3 6 G D 1 7 8 H E, F 4 4 6 1 G H 1 6 00 J I 2. 5 7 K 1 00 8 9 11 L J 2 4 6 M K 1 N 3 N LM 6 8 10 Px Gantt Chart D E F G 4 K 10 20 30 40 50 60 Time Critical Activity Noncritical Activity Slack C 1 3.21 2 3 Project Management Precedences; 3 time estimates 4 Enter the times in the appropriate columns). Enter the precedences, one per column. (Do not 5 Uso commas), 6 Data C 7 Activity Optimisti Likely Pessimistic Mean Std dev Variance 8 A 6 5.8333 0.5 0.25 9 9 B 1 2 3 2 0.333333 0.111111 10 C 6 6. 6 6 0 0 1 11 D 5 8 11 8 1 12 E 11 1 91 18 9.1667 2.833333 8.027778 1 13 F 2 3 6 3.3333 0.666667] 0.444444 M 14 G 1 7 8 6.16670 1.166667) 1.361111 0 15 H 4 4 6 4.3333 0.333333 0.111111 16 0 1 6 8 5.5) 1.1666671 1.361111 17 ) ) 2 5 7 4.8333 0.833333 0.694444 18 K 8 91 11 9.1667 0.5 0.25 19 L 2. 4 E 6 40.666667 0.6666671 0.444444 20 M 1 2 3 21 0.333333 0.111111 21 N 6 8 10 8 0.666667 0.444444 22 Precedences Immediate Predecessors (1 per column) 23 Activity Time Pred 1 Pred 2 24 A 5.8333 x X 53 25 B 2. mu 50 26 C 6A sigma 0.897527 27 D 8 a . 28 E 9.1667 b 0.999585 29 F 3.3333 d 30 G 6.16670 31 H H 4.3333e f 320 5.5 g Ih 33 ) 4.8333 34 K K 9.16670 35 L 4 36 M 2k 37 N 8L m 38 39 Results Early Late 40 Activity Early Start Finish Late Start Finish Slack Variance Variance 41 A 0 5.8333 19.167 25 19.167 0.25 42 B 0 2 29 31 29 0.111111 43 C 5.8333 11.833 25 311 19.167 0 44 D 5.8333 13.833 28.8331 36.833 23 1 45 E 11.833 21 31 40.167 19.167 8.027778 46 F 13.833 17.167 36.833 40.167 23 23 0.444444 47 G 13.833 20 38.333 44.5 24.5 1.361111 48 H 21 25.333| 40.167 44.5 19.167 0.111111 49 1 25.333 30.833 44.5 50 19.167 1.361111 50 D 30.833 35.667 41.1671 46 10.333 0.694444 51 K 30.833 40 30.833 40 0 0.25 0.25 52 L 35.66739.667 46 50 10.333 0.444444 53 M 40 42 40 42 0 0.111111] 0.111111 54 N 42 50 42 50 0 0.4444441 0.444444 55 Project 50 Project 0.805556 56 Std.dev 0.897527 57 Early start computations 58 A 0 0 Critical