Question 3 (multiple choice worth 5 points)

(08.01)ben takes a random sample of 25 students in his seventh-grade class and finds that 85% of the sample prefers math over science. there are 150 students in the seventh grade. based on the sample proportion, about how many students in the seventh grade would be expected to prefer math over science?

25

85

150

128

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question 4 (multiple choice worth 5 points)

(08.01)mark wants to know how many families in his neighborhood plan to attend the neighborhood party. he puts all 80 of the neighborhood addresses in a hat and draws a random sample of 20 addresses. he then asks those families if they plan to attend the party. he finds that 20% of the families plan to attend the party. he claims that 20% of the neighborhood families would be expected to attend the party. is this a valid inference?

no, this is not a valid inference because he asked only 20 families

no, this is not a valid inference because he did not take a random sample of the neighborhood

yes, this is a valid inference because he took a random sample of the neighborhood

yes, this is a valid inference because the 20 families speak for the whole neighborhood

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Complete the worksheet. use 3.14 for π and round all decimals to the nearest hundredth.find the volume of the composite three-dimensional figure above. important terms are written in bold.1. the pyramid has a square base that is inscribed in the circular base of the cone. draw an image of the composite shape of the base. 2. if the side length of the square base is 8 units long, what is the diameter of the circular base of the cone from the picture in number 1? 3. now that the diameter has been calculated, what is the circular area of the cone? ignore the square base of the pyramid.? 4. what is the formula for volume of a cone? 5.to calculate the volume of the cone, the height is still needed. if the cone has a lateral surface with a length of 13 units, what is the height of the cone? 6.now find the volume of the cone. do not include the empty space for the pyramid. 7.. the side length of the square base of the pyramid is 8 units long. what is the base area of the pyramid? 8.what is the formula for the volume of a pyramid9. since the cone and the pyramid share the same vertex, what is the volume of the pyramid10.using the volume of the cone and the pyramid, find the volume of the composite shape. remember, the pyramid is empty. 11,. referring to the picture in number 1, what is the area of the composite base knowing that the square is empty? 12what is the formula to find the lateral surface area of a cone? (13find the lateral surface area of the cone14what is the lateral surface area shape of the pyramid? what is the formula for its area? 15to find the lateral surface area of the pyramid the length is still needed. calculate the lateral surface length of the pyramid. 16 now that the lateral surface length is known, what is the lateral surface area of the pyramid17. using the lateral surface areas of the cone and pyramid, along with the area of the composite base, what is the total surface area?