The Oldfaithful.xlsx file gives the duration between eruptions of the Old Faithful geyser and the length of the next eruption. Suppose it has been four minutes since the last eruption. You are 95 percent sure that the length of the next eruption is between ____ and ____ minutes.

Minutes between eruptions	Duration of eruption
3.6	79
1.8	54
3.333	74
2.283	62
4.533	85
2.883	55
4.7	88
3.6	85
1.95	51
4.35	85
1.833	54
3.917	84
4.2	78
1.75	47
4.7	83
2.167	52
1.75	62
4.8	84
1.6	52
4.25	79
1.8	51
1.75	47
3.45	78
3.067	69
4.533	74
3.6	83
1.967	55
4.083	76
3.85	78
4.433	79
4.3	73
4.467	77