Answer:
(b) The probability is 0.375
(c) The probability is 0.750
Step-by-step explanation:
The probability is calculated as a division between the number of options that satisfy a condition and the total number of options.
For part (b), we have 8 cavities or options for obtain the part but we want to obtain the part from cavity 1, 2 or 3, so we have 3 options. Therefore, the probability is:

For part (c), We have 8 cavities or options for obtain the part and we want to obtain the part from any cavity except cavity 3 or 4, so we have 6 options. These options are cavity 1, cavity 2, cavity 5, cavity 6, cavity 7 and cavity 8. Then, the probability is:

Answer:
B
Step-by-step explanation:
There is a negative correlation. The direction of a line if we plot it generally through thi scatter plot would be going down, negative.
Answer:
25%=$8.74 7.5%=$2.62
Step-by-step explanation:
Answer:
3\16
Step-by-step explanation:
movement of snail per hour,1/8×3/2=3/16