Prepare a run chart for the following $911$ call data. Use five$-$minute intervals $($i$.$e$.,$ count the calls received in each five$-$minute interval, and use intervals of $0-4,5-9,$ etc.$).$ Note: Two or more calls may occur in the same minute; there were three operators on duty this night. What can you conclude from the run chart?

Call$1234$

Time

$1$:$03$

$1$:$06$

$1$:$09$

$1-11$

Call

$15$

$16$

$17$

$18$

$5$

$6$

$1$:$12$

$1$:$17$

Time

$1$:$43$

$1$:$44$

$1$:$47$

$1$:$48$

$1$:$50$

$1$:$52$

Call

$29$

$30$

$31$

$32$

$33$

$34$

$7$

Time

$2$:$03$

$2$:$04$

$2$:$06$

$2$:$07$

$2$:$08$

$2$:$08$

$2$:$11$

$8$

$9$

$10$

$11$

$1$:$21$

$1$:$27$

$1$:$28$

$1$:$29$

$1$:$31$

$12$

$1$:$36$

$1$:$39$

$13$

$14$

$1$:$42$

$19$

$20$

$21$

$22$

$23$

$24$

$25$

$26$

$27$

$28$

$1$:$53$

$1$:$56$

$1$:$56$

$2$:$00$

$2$:$00$

$35$

$36$

$37$

$38$

$39$

$40$

$2$:$01$

$2$:$02$

$2$:$03$

$41$

$42$

$2$:$12$

$2$:$12$

$2$:$13$

$2$:$14$

$2$:$14$

$2$:$16$

$2$:$19$