Answer:
D.
Step-by-step explanation:
Ancient cities developed mainly along the Indus River, while modern cities developed near different bodies of water.
Answer:
a) 19.6%
b) 9.93%
c) 55.515 hours
Step-by-step explanation:
The average American last year worked 44 hours per week and a population standard deviation of 7 hours.
We solve using z score formula
z = (x-μ)/σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation.
a) What percentage of people work at least 50 hours per week?
At least means greater than or equal to
z = 50 - 44/7
z = 0.85714
P-value from Z-Table:
P(x<50) = 0.80432
P(x>50) = 1 - P(x<50) = 0.19568
Converting to Percentage
= 0.19568 × 100
= 19.568
= 19.6%
b) What percentage of people work less than 35 hours per week?
z = 35 - 44/7
z = -1.28571
P-value from Z-Table:
P(x<35) = 0.099271
Converting to percentage
= 0.099271 × 100
= 9.9271 %
= 9.93%
c) How many hours does someone need to work to be in the upper 5% of hours worked per week?
Upper 5% = 95%
z-score for 95th percentile = 1.645
Hence:
1.645 = x - 44/7
Cross Multiply
1.645 × 7 = x - 44
x = 44 + (1.645 × 7)
x = 44 + 11.515
x = 55.515 hours
C lololol it’s not actually 70 but that’s the closest one
1<|2x2|= 1<4
Nei valori assoluti non importa il segno che c'è davanti al numero, esso sarà sempre positivo, però qua non c'è neanche un meno perciò basta fare 2x2 (boh, non spiego bene)
