Modify problem $3$ so that the user does not need to know how many values will be entered. Create a python program with a new solution that reads a list of values from the user until the user enters a sentinel value of $-1.$ At that point the average of the values entered should be displayed $($not including the sentinel value$)$

This is how i did question $3$

nvalues $=$ int$($input$("$How many values do you want to enter? $"))$

total $=0$

counter $=1$

while$($counter $<=$ nvalues$)$:

num $=$ float$($input$("$Enter a number: $"))$

total $=$ total $+$ num

counter $=$ counter $+1$

average $=$ total $/$ nvalues

print$("$total: $",$ total$)$

print$("$average: $",$ average$)$