So if the standard deviation is 6 bpm, and the mean = 180, then +1s = 186, +2s = 192, -1s = 174, -2s = 168
a. The % less than 187 are all, including and less than, +1s. So 50% + 34.1% (1s) = 84.1% of the puppies
b. The % between 170 and 187 would be between -1.5s and +1s. So (34.1% × 2) + (13.6/2) = 68.2% + 6.8% = 75% of the puppies
c. Since in a) we said that the % for less than 187 bpm was 84.1%, we just take that % of 500: .841×500 = 420.5, so we'd expect between 420 and 421 puppies
d. 10% of all.puppies will have a heart rate greater than? This is asking what deviation above the mean corresponds to 10%.
This will be around those above around +1.5s, so around 188 bpm
Answer:
1 5/8 miles
Step-by-step explanation:
Min:
2+3=5, 3/8+1/8=4/8
5 4/8 miles
Jessica:
1+2=3, 5/8+2/8=7/8
3 7/8 miles
5 4/8- 3 7/8= 1 5/8 miles
Answer:
126
Step-by-step explanation:
180 - ( 19x + 3 ) + 9x + 1 + 11x - 2 = 180
180 - 19x - 3 + 9x + 1 + 11x - 2 = 180
- 19x - 3 + 9x + 1 + 11x - 2 = 180 - 180
- 19x - 3 + 9x + 1 + 11x - 2 = 0
x - 4 = 0
x = 4
136 = 2x^2 + 8
128 = 2x^2
64 = x^2
8 = x