B r = 178 + h;
b r + h = 676;
then, 178 + 2h = 676 => h = 498/2 = 249 => b r = 178 + 249 = 427;
Answer:
4:!
Step-by-step explanation:
4:1 because their are 4 boys for every 1 girl
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➷ Housing: 1800/4500 x 100 = 40%
Transportation: 800/4500 x 100 = 17.7%
Utilities: 175/4500 x 100 = 3.8%
Food: 550/4500 x 100 = 12.2%
Savings: 300/4500 x 100 = 6.6%
Loan: 300/4500 x 100 = 6.6%
Other: 575/4500 X 100 = 12.7%
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15/7 is approximately 2.143
Answer:
90% CI expects to capture u 90% of time
(a) This means 0.9 * 1000 = 900 intervals will capture u
(b) Here we treat CI as binomial random variable, having probability 0.9 for success
n = 1000
p = 0.9
For this case, applying normal approximation to binomial, we get:
mean = n*p= 900
variance = n*p*(1-p) = 90
std dev = 9.4868
We want to Find : P(890 <= X <= 910) = P( 889.5 < X < 910.5) (integer continuity correction)
We convert to standard normal form, Z ~ N(0,1) by z1 = (x1 - u )/s
so z1 = (889.5 - 900 )/9.4868 = -1.11
so z2 = (910.5 - 900 )/9.4868 = 1.11
P( 889.5 < X < 910.5) = P(z1 < Z < z2) = P( Z < 1.11) - P(Z < -1.11)
= 0.8665 - 0.1335
= 0.733
