Chloe drives from her house to her grandmas house 48 miles away in an hour and 12 minutes. How fast was she driving on average?
1 answer:
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Answer:
Z = -1.65
Step-by-step explanation:
The main objective is to compute the data for the Z value and determine the of the sample distribution
Given that;
the tires' thickness is normally distributed with a mean μ = 0.45 in
standard deviation σ = 0.05 in
sample size = 65 tires
Also; we are being told that the thickness separates the lowest 5% of the means from the highest 95%
∴
P(Z < Z) =0.05
From the Z- table
P(Z < -1.645) = 0.05
Z = -1.65
Similarly;
Let consider to be the sample mean;
Then:
mean
standard deviation
= 0.00620174
By applying the Z-score formula:
x = μ + ( Z × σ )
Answer:
x = 3.36
Step-by-step explanation:
, if we have a fraction = fraction then we can cross multiply to have a multiplication problem
x · 1 = 8 · 0.42, multiply
x = 3.36
Here's the solution ~
Now we will use this identity in denominator
[ a² - b² = (a + b)(a - b) ]