Translation.
The flat only shifts upwards or downwards, and it doesn’t turn around.
1.5 minutes = 90 second
The probability density function is

so the probability of interest is


Answer:
62.34
Step-by-step explanation:
Substitute n = 0 to n = 5 into the expression and sum the terms, that is
3 [
+
+
+
+
+
]
= 3 [ 1 +
+
+
+
+
]
= 3(
)
= 3 × 20.781
= 62.34 ( to the nearest hundredth )
Measure × measure × measure