8 blocks because 2/10=1/5 so if they total 4/5 then 2/10+2/10+2/10+2/10=8/10=4/5

Given:
population mean, μ =135
population standard deviation, σ = 15
sample size, n = 19
Assume a large population, say > 100,
we can reasonably assume a normal distribution, and a relatively small sample.
The use of the generally simpler formula is justified.
Estimate of sample mean

Estimate of sample standard deviation


to 5 decimal places.
Thus, using the normal probability table,





Therefore
The probability that the mean weight is between 125 and 130 lbs
P(125<X<130)=0.0731166-0.0018308
=
0.0712858
981,657 = 980,000 to the nearest ten thousand
Hope it helps
Answer:
Step-by-step explanation:
y-5/x+1 = -3/7
7(y-5)=-3(x+1)
7y-35=-3x-3
7y+3x-32=0
Answer:
-7 and -5
Step-by-step explanation: