Seven students cut 5 and three-fourths inches of thread from a spool for a school project. What number represents the change in

Unlikely to have a significant difference.

Determine the percentage of families who spent: a. Under $167 daily. b. Under $367 daily. c. Over $247 daily. d. Over $350 daily. e. Under $67 daily. f. Between $200 and $300 daily. g. Between $360 and $400 daily. h. Exceeding the median. i.

Answer:

0.0359

Step-by-step explanation:

Provided values:

Mean durations of three independent processes are 15, 30, and 20 minutes.

The associated standard deviations are 2, 1, and 1.6 minutes, respectively.

Thus,

New Mean = 15 + 30 + 25 = 65

Variance = (standard deviation)²

or

Variance = 2² + 1² + 1.6² = 7.56

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Standard deviation = √variance

or

Standard deviation = 2.75

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Z-value =

or

Z-value = - 1.81

Consulting the Z-table, the Probability of Z ≤ -1.81 is equal to 0.0359.

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