El Edison Electric Institute publica cifras del número de kilowatts hora que gastan anualmente varios aparatos electrodomésticos. Se afrma que una aspiradora gasta un promedic igual a 46 kilowatts-hora al año. Si una muestr aleatoria de 12 hogares, que se incluye en un estudio planeado, indica que las aspiradoras gastan un promedio de 42 kilowatts-hora al año con una desviación estándar de 11.9 kilowatıs-hora, cesto sugiere que las aspiradoras gastan, en promedio, menos de 46 kilowatts hora al año a un nivel de significancia de 0.05 ?

Qery Short Ans. Type Ques. Add \( 17 a^{2} b c, 13 a b c^{2} \) and \( 5 a b^{2} c \).

A population of bacteria is growing according to the equation \( P(t)=650 e^{0.15 t} \). Use a graphing calculator to estimate when the population will exceed 1066 . \( t=\square \) Give your answer accurate to one decimal place. Question Help: \( \square \) Video

A fruitseller purchased 60 oranges at the rate of 12 for \( ₹ 10 \). He sold them at the rate of 10 for \( ₹ 12 \). What is his profit or loss? \( \begin{array}{lll}\text { (A) } ₹ 22.00 \text {, profit } & \text { (B) } ₹ 22.00 \text {, loss } \\ \text { (C) } ₹ 2.00 \text {, profit } & \text { (D) } ₹ 2.00 \text {, loss }\end{array} \)

a \( \frac{1}{3}, \frac{1}{4}, \frac{1}{5} \)

The differential equation below models the temperature of a \( 95^{\circ} \mathrm{C} \) cup of coffee in a \( 21^{\circ} \mathrm{C} \) room, where it is known that the coffee cools at a rate of \( 1^{\circ} \mathrm{C} \) per minut temperature of the cup of coffee in \( { }^{\circ} \mathrm{C} \) and let \( t \) be the time in minutes, with \( t=0 \) corresponding to the time when the temperature was \( 95^{\circ} \mathrm{C} \).) \[ \frac{d y}{d t}=-\frac{1}{50}(y-21) \] Need Help? Rasit Mastern