Arandom sample of 150 students has a grade point average with a
mean of 2.86. assume the population standard deviation is 0.78.
construct the confidence interval for the population mean, u, if
c = 0.98.

2.7065 to 3.0135

Step-by-step explanation:

1. find the z-score

zscore=(value {or c in this case} - mean) / standard deviation

= (.98 - 2.86) / .78

= - 2.4102

2. find the confidence interval

confidence int= mean (+ or -) zscore x (standard diviaion) / the square root of n

=2.86+\- -2.4102 (0.78) / square root of 150

=2.86 +\- -0.1535

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step-by-step explanation:

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system