105 minutes per day = hours per week

Mathematics

2 answers:

olga55 [171]4 years ago

5 0

105 × 7 = 735 ÷ 60 = 12.25

IRISSAK [1]4 years ago

4 0

Hi there! 105 minutes per day*7 days a week=735. 735÷60=12.25. Therefore, 105 minutes per day=12.25 hours per week.

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The weights of cockroaches living in a typical college dormitory are approximately distributed with a mean of 80 grams and a sta

Romashka [77]

Answer:

The percentage of cockroaches weighing between 77 grams and 83 grams is about 55%.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 80, \sigma = 4$