Sue wants to know how many families in her small neighborhood of 50 homes would volunteer to help at a neighborhood animal shelter. She put all the addresses in a bag and drew a random sample of 25 addresses. She then asked those families if they would volunteer to help at the shelter. She found that 18% of the families would volunteer to help at the shelter. She claims that 18% of the neighborhood families would be expected to help at the animal shelter. Is this a valid inference?A Yes, this is a valid inference because the 25 families speak for the whole neighborhood

B Yes, this is a valid inference because she took a random sample of the neighborhood

C No, this is not a valid inference because she only asked 25 families

D No, this is not a valid inference because she did not take a random sample of the neighborhood

Selina earns 8% commission on sales. On one sale,her commission was $20.40. What was the amount of that sale?

Triple the sum of 45 and 55

Todd begins piano practice at 4:15 P.M. and ends at 5:50 P.M. How long does he practice?

Students were surveyed about their favorite colors one fourth of the students preferred red 1/8 of the students preferred blue, and3/5 of the remaining students preferred green. If 15 students prefer green how many students were surveyed

in the central city grand prix out of 30 cars that started the race,12 of them finished. what percent of the cars finished the race? what percent did not finished the race?

What is 28.5 rounded to the nearest one