Refer to earlier exercise. The Sylvania CFL 65-watt replacement bulbs that utilise only 16 watts are advertised as having an average lifespan of 8000 hours on their packaging. Assume that the average lifespan of each of these bulbs is 8000 hours, with a 400-hour standard deviation. Determine the likelihood that a random sample of 25 of these bulbs will have a mean life of a. less than 7890 hours b. between 7850 and 7910 hours c. within 130 hours of the population mean d. less than the population mean by 150 hours or more

When you add a suffix that begins with a vowel to a word that ends in a consonant, the spelling of the original word does not change. For example, inspect + or = inspector. Add -ance, -ish, or -er to each word below to form three properly spelled words. child

When you add a suffix that begins with a vowel to a word that ends in a consonant, the spelling of the original word does not change. For example, inspect + or = inspector. Add -ance, -ish, or -er to each word below to form three properly spelled words. travel

A researcher would like to determine, within 3 percentage points and with $90 \%$ confidence, the percentage of Americans who have a certain characteristic. If she feels certain that the percentage is somewhere between $20 \%$ and $40 \%$, how many persons should be included in the sample?

Find the instantaneous of change of the volume of a cube with respect to its edge length $x$ as $x$ changes from

$x=5$.

Find the percentage.

$$\$3620 \times 9\%$$

When you add a suffix that begins with a vowel to a word that ends in a consonant, the spelling of the original word does not change. For example, inspect + or = inspector. Add -ance, -ish, or -er to each word below to form three properly spelled words. accept

Find the percentage.

$6 \%$ of $48$

Find the percentage.

96% of 148,000

If a word ends in two consonants, do not change the consonants when you add a word ending. Thus, encroach + ing = encroaching. Add -ful, -ive, or -en to the words below to create. three properly spelled new words. help

Find the percentage. 23.5% of $23.50

Find the percentage.

$$\$950 \times 8\%$$

If the truck brakes and the crate slides to the right relative to the truck, the horizontal acceleration of the crate is given by $\overline{s}=-g \mu_{k},$ where g is the acceleration of gravity, $\mu_k=0.87.$ is the kinetic friction coefficient, and s is the position of the crate relative to a coordinate system attached to the ground (rather than the truck). Assuming that the crate slides without hitting the right end of the truck bed, determine the time it takes to stop if its velocity at the start of the sliding motion is $v_0 = 55 mph.$

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