Answer:
a: 28 < µ < 34
Step-by-step explanation:
We need the mean, var, and standard deviation for the data set. See first attached photo for calculations for these...
We get a mean of 222/7 = 31.7143
and a sample standard deviation of: 4.3079
We can now construct our confidence interval. See the second attached photo for the construction steps.
They want a 90% confidence interval. Our sample size is 7, so since n < 30, we will use a t-score. Look up the value under the 10% area in 2 tails column, and degree of freedom is 6 (degree of freedom is always 1 less than sample size for confidence intervals when n < 30)
The t-value is: 1.943
We rounded down to the nearest person in the interval because we don't want to over estimate. It said 28.55, so more than 28 but not quite 29, so if we use 29 as the lower limit, we could over estimate. It's better to use 28 and underestimate a little when considering customer flow.
Simplifying the expression gives 36x^2 - 82x - 10 = 0
<h3>How to simplify the expression</h3>
Given the expression;
4x-5/3+2x=7+2/9x+2
Cross multiply
Expand the bracket
Collect like terms
36x^2 + 8x - 45x - 27x - 18x = 0
Add the like terms
36x^2- 82x - 10 = 0
Thus, simplifying the expression gives 36x^2- 82x - 10 = 0
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Answer:
6^20
Step-by-step explanation:
When two indices are in brackets, you just have to multiply them.
The range of the function f(x) = 3x^2 + 6x - 8 is <span>{y|y ≥ –11}</span>
The table that represents a function is:
<h3>What is a Function?</h3>
A function is an expression that represents the relationship between two variables. The variables in this case are the dependent and independent variables.
To identify a function, you need to note that no variable of x should be equal to y.
The formular is represented this way: y = f(x). The table that satisfies this condition is the Y table.
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