A group of 100 subjects ages are normally distributed

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#1

A group of 100 subjects ages are normally distributed with a mean of 41 years and a standard deviation of 4 years. Select the true statement

    1. At least 5 subjects will be older than 49
    1. 50 of the subjects will be between 39 and 43 years of age
    1. 50% of the cohort will be between the age 37 and 45
    1. 16 subjects will be below 37 years of age
    1. 75 members of the study will be aged 37 and 45

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EXP:

When the distribution is normal two thirds of the variable with be within within 1 standard deviation of the mean. One sixth will lie below the lower limit of the standard deviation and one sixth will lie above the upper limit of the standard deviation. Two standard deviations will cover 95% of values, so 2.5% will be over 2 standard deviations from the mean and 2.5% below.