How do I figure t and the p-value using excel formulas?

A real estate brokerage claims it can sell their listings in 30 days or less. Sam is preparing to sell and list his home but wants to test the brokerage's claim. He randomly samples 100 homes the brokerage recently sold and records the days on market. Using a 5 percent significance level, should Sam believe the brokerage claim and list his home with them?
Required:
H0:			30
Ha:			30
Using the data contained in tab "Days on Market", determine the following:
Sample Mean	27.3
Sample Standard Deviation	8.523882077
Sample Size	100
t =
p-value:
Do you reject or not reject the null hypothesis at alpha = 0.05?	Reject	since p-value is	<	alpha.
Therefore, the Real Estate Brokerage claim is	correct	.

Days on Market

29

22

30

10

19

28

24

27

35

13

38

31

28

31

32

34

33

27

25

29

23

32

20

32

39

35

33

24

27

37

33

34

40

23

27

29

38

23

29

21

21

25

29

21

33

28

1

40

31

22

32

10

26

38

38

28

38

25

30

30

27

27

36

35

46

33

16

22

29

22

11

19

13

26

15

49

21

29

27

19

33

31

14

23

20

54

22

25

20

38

23

29

25

26

20

11

31

25

17

31