<em>Answer:</em>
<em>$ 60</em>
<em>Step-by-step explanation:</em>
<em>Hi there !</em>
<em>100% ............ $80</em>
<em>75% ................$ x </em>
<em>x = 75×80/100</em>
<em>= 6000/100</em>
<em>= $ 60</em>
<em>Good luck ! </em>
Answer: the sample size should be 39
Step-by-step explanation:
The sample mean is the point estimate for the population mean. Confidence interval is written as
Sample mean ± margin of error
Margin of error = z × σ/√n
Where
σ = population standard Deviation
n = number of samples
z represents the z score corresponding to the confidence level
From the information given,
σ = 4 minutes
Margin of error = 75 seconds. Converting to minutes, it becomes 75/60 = 1.25 minutes
To determine the z score, we subtract the confidence level from 100% to get α
α = 1 - 0.95 = 0.05
α/2 = 0.05/2 = 0.025
This is the area in each tail. Since we want the area in the middle, it becomes
1 - 0.025 = 0.975
The z score corresponding to the area on the z table is 1.96. Thus, confidence level of 95% is 1.96
Therefore,
1.25 = 1.96 × 4/√n
1.25/1.96 = 4/√n
0.6378 = 4/√n
√n = 4/0.6378 = 6.27
n = 6.27² = 39
26% of 84 = 21.84. hope that helps
Answer:
5.44444442889 or 5 
Step-by-step explanation:
Just multiply the 2 numbers together
Answer:
a <em>kite</em> or a <em>square</em>
Step-by-step explanation:
The fact that the diagonals are congruent is irrelevant, unless you also know something about where they cross each other.
A <em>kite</em> has perpendicular diagonals. If they happen to bisect each other, then the result is a <em>rhombus</em>. If the diagonals are congruent, then that rhombus is a <em>square</em>.
<em>Other ways to get there</em>
A pair of congruent diagonals that cross each other symmetrically will define a trapezoid. If they also bisect each other, the result is a rectangle. If the diagonals of that rectangle are perpendicular, then it is a <em>square</em>.
