Answer:
Step-by-step explanation:
Both 115 and 145 mph are above the mean. Draw a normal curve and mark these speeds. 115 mph is 1 standard deviation above the mean; 130 would be 2 standard deviations above the mean; and 145 would be 3 s. d. above it.
We need to find the area under the standard normal curve between 115 and 145. This is equivalent to the area under the standard normal curve between z = 1 and z = 3.
I used my TI-83 Plus calculator's DISTR function "normalcdf(" to calculate this area: normalcdf(1, 3) = 0.1573.
The area between z = 1 and z = 3 is 0.1573. In other words, the percentage of serves that were between 115 and 145 mph was 15.73%.
I can’t see it is too burly I’m Srry
Answer:
1,120 cm³
Step-by-step explanation:
Hello!
<u>Think about it this way:</u> There is a rectangular prism, with lengths of 20cm, 12cm, and 10cm, and another rectangular prism cut out of it with lengths, of 8cm, 8cm, and 20cm.
<h3>Larger rectangular prism</h3>
Volume = L * W * H
- V = 20cm * 12cm * 10cm
- V = 2,400cm³
<h3>Cut-Out Rectangular Prism</h3>
V = L * W * H
Subtract:
The total volume is 1,120cm³
