From the given problem the same size is n = 70. Df = n – 1 =
70 – 1 = 69.
The population mean is u = 30, sample standard deviation is
s = 10 and the sample size is n = 70. Then,
t = x – u / s sqrt of n
1.995 = x – 30 / (10 sqrt of 70)
1.995 = x – 30 / 1.1952
X – 30 = 1.995 (1.1952)
X – 30 = 2.3844
X = 30 + 2.3844
X = 32.3844
The sample mean is 32.3844
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Answer:
C
Step-by-step explanation:
1 1/4 = 1.25
1 4/5 = 1.8
1.8+1.25=3.05=3 1/20
Answer:
-450
Step-by-step explanation:
Say the first number is x to get the idea.
The first 150 terms are 150x - 5 * 150
15x - 750
300 - 750 = -450
Answer:
x=7
Step-by-step explanation:
3x+9x=6x+42 add simalar elements 3x+9x=12x
12x=6x+42
12x-6x=6x+42-6x subract 6x from both sides
6x=42 simplify
6x/6=42/6 divide both by 6
x=7
Solve:
Do the parenthesis first, so 4*9=36
Now multiply it by 1.
1*36=36
Final answer: 36
