Students recorded the dates in May on which they observed a full moon and a last quarter moon.
May
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
01
02
03
04
Full
05
06
07
08
09
10
11
Last quarter
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
On which date will they most likely be able to observe a first quarter moon?
1.May 13
2.May 18
3.May 31
4.May 25
2. May 18
The first quarter moon typically occurs about a week after the last quarter moon, so the students are most likely to observe a first quarter moon on May 18.