Answer:
Step-by-step explanation:
1+sin²(a) +cos²(a) =2
note : for all a in R : sin²(a) +cos²(a) =1
so : 1+sin²(a) +cos²(a) = 1+1 =2
Answer:
Step-by-step explanation:
Total sum of age of 12 students = 12*18 = 216;
Total sum of age of 8 students = 8*23 = 184;
Total sum of age of 20 students = 216+184 = 400;
Mean age of all the students = total age / number of students;
= 400/20 = 20 year
Step-by-step explanation:
Answer:
b=4
Step-by-step explanation:
The events are dependent.
When the first card is not replaced, you change the probability of the second card. At the very least, you have changed the total number of cards to draw from.