So to find the mean you add them all together and divide by the number of numbers there is so 11+15+19+17+23+20+17+18+21=174 and there are 10 numbers so it would be 174/10 which is 17.4 so you answer is 17.4
Answer:
125 - 12 /3 = 125 - 4 = 121
Step-by-step explanation:
Please refer to the attachment for the answer and explanation. Hope it helps!!