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Questions in Grade College

[Done] Suppose that, on average, electricians earn approximately [tex]$\mu=$54,000[/tex] per year in the United States. Assume that the distribution for electricians' yearly earnings is normally distributed and that the standard deviation is [tex]$\sigma=$12,000[/tex]. Given a sample of four electricians, what is the standard deviation for the sample mean? a. 36,000 b. 6,000 c. 54,000 d. 12,000

[Done] Westside Energy charges its electric customers a base rate of $4.00 per month, plus 10¢ per kilowatt-hour (kWh) for the first 300 kWh used and 2¢ per kWh for all usage over 300 kWh. Suppose a customer uses [tex]$\times kWh$[/tex] of electricity in one month. (a) Express the monthly cost [tex]$E$[/tex] as a piecewise defined function of [tex]$x$[/tex]. (Assume [tex]$E$[/tex] is measured in dollars.) [tex]$E(x)=\left\{\begin{array}{ll} //, & \text { if } 0 \leq x \leq 300 \\ //, & \text { if } 300\ \textless \ x \end{array}\right.$[/tex] (b) Graph the function [tex]$E$[/tex] for [tex]$0 \leq x \leq 600$[/tex].

[Done] Which country was the closest where refugees of Tutsi fled to? A. Congo B. Burundi C. Uganda D. Tanzania

[Done] True or False: Judaism is an historical religion because it claims that we know God based on what God has done in history.

[Done] Our ears are best at hearing A. ultrasonic sound. B. both of these C. infrasonic sound. D. none of the above

[Done] Example 7: It is estimated that $x$ months from now, the population of a certain community will be $P(x)=x^2+20 x+8000$ (a) At what rate will the population be changing with respect to 15 months from now? (b) By how much will the population actually change during the $16^{\text {th }}$ month?

[Done] Scott is planning to buy a new car. He intends to trade in his existing car, a 2001 Chrysler Concorde in good condition. Using the table below, estimate how much Scott's car is worth. | Model/Year | 2000 | 2001 | 2002 | 2003 | 2004 | | :---------- | :------- | :------- | :------- | :------- | :------- | | Pacifica | $2,194 | $2,288 | $2,605 | $2,690 | $2,814 | | Concorde | $1,842 | $1,998 | $2,180 | $2,781 | $2,925 | | Sebring | $2,920 | $3,075 | $3,260 | $3,551 | $3,912 | | 300M | $2,770 | $2,934 | $3,095 | $3,188 | $3,676 | A. $2,781 B. $1,842 C. $2,288 D. $1,998 Please select the best answer from the choices provided

[Done] Is the belief that your intellectual ability is set at birth and are fixed traits, which cannot change over time: A. Growth mindset B. Synaptic formation C. Fixed mindset D. None of these

[Done] Modern research indicates environmental factors can influence genetic development. A. True B. False

[Done] To increase school connectedness, families do not need to be actively involved in their child's academic and school life. True or False