49 students are selected at random from sophomore class 39 from the junior class and 48 from senior class what type of sampling is used simple random ,stratified , systematic ,convenience

(B)Stratified

Step-by-step explanation:

Stratified sampling refers to a sampling method in which the entire population is first divided into groups/strata before a random sample is taken from each strata.

The school population in this case has been divided into these strata,

From these classes, a random sample of 49,39 and 48 students respectively was then taken,

10/60

step-by-step explanation:

if you divide 10 by 60 the answer is 0.166666 while if you divide or solve the other problems it equals 0.6

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)